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{{Short description|Totality of existing entities}}
{{About|the totality of entities|other uses|World (disambiguation)}}
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{{Use British English|date=January 2018}}
{{Use dmy dates|date=September 2020}}

[[File:Hubble ultra deep field.jpg|320px|thumb|Image of the physical world, captured by the [[Hubble Space Telescope]]]]

The '''world''' is the totality of entities, the whole of [[reality]], or everything that [[Existence|exists]].<ref>{{cite web |title=World |url=http://wordnetweb.princeton.edu/perl/webwn?o2=&o0=1&o8=1&o1=1&o7=&o5=&o9=&o6=&o3=&o4=&s=world |website=wordnetweb.princeton.edu |publisher=Princeton University |access-date=14 August 2021}}</ref> The nature of the world has been [[conceptualize]]d differently in different fields. Some conceptions see the world as unique, while others talk of a "plurality of worlds". Some treat the world as [[#Monism and pluralism|one simple object]], while others analyze the world as a complex made up of parts.

In [[#Scientific cosmology|scientific cosmology]], the world or universe is commonly defined as "the totality of all space and time; all that is, has been, and will be". [[#Theories of modality|Theories of modality]] talk of possible worlds as complete and consistent ways how things could have been. [[#Phenomenology|Phenomenology]], starting from the horizon of co-given objects present in the periphery of every experience, defines the world as the biggest horizon, or the "horizon of all horizons". In [[#Philosophy of mind|philosophy of mind]], the world is contrasted with the mind as that which is represented by the mind. 

[[#Theology|Theology]] conceptualizes the world in relation to God, for example, as God's creation, as identical to God, or as the two being interdependent. In [[#Religion|religions]], there is a tendency to downgrade the material or sensory world in favor of a spiritual world to be sought through religious practice. A comprehensive representation of the world and our place in it, as is found in religions, is known as a [[#Worldviews|worldview]]. [[#Cosmogony|Cosmogony]] is the field that studies the origin or creation of the world, while [[#Eschatology|eschatology]] refers to the science or doctrine of the last things or of the end of the world.

In various contexts, the term "world" takes a more restricted meaning associated, for example, with the [[Earth]] and all life on it, with humanity as a whole, or with an international or intercontinental scope. In this sense, [[#World history|world history]] refers to the history of humanity as a whole, and [[#World politics|world politics]] is the discipline of political science studying issues that transcend nations and continents. Other examples include terms such as "[[world religion]]", "[[world language]]", "[[world government]]", "[[world war]]", "[[world population]]", "[[world economy]]", or "[[world championship]]".

== Etymology ==
The [[English language|English]] word ''[[:wikt:world|world]]'' comes from the [[Old English]] {{Lang|ang|weorold}}. The Old English is a reflex of the [[Common Germanic]] ''*''{{Lang|mis|weraldiz}}<!-- Proto-Germanic -->, a compound of {{Lang|mis|weraz}} 'man' and {{Lang|mis|aldiz}} 'age', thus literally meaning roughly 'age of man';<ref>{{Cite web|url=https://www.bartleby.com/|archive-url=https://web.archive.org/web/20080512075921/http://www.bartleby.com/61/roots/IE588.html|title=Homework Help and Textbook Solutions &#124; bartleby|archive-date=12 May 2008|website=Bartleby.com}}</ref> this word led to [[Old Frisian]] {{Lang|ofs|warld}}, [[Old Saxon]] {{Lang|osx|werold}}, [[Old Dutch]] {{Lang|odt|werolt}}, [[Old High German]] {{Lang|goh|weralt}}, and [[Old Norse]] {{Lang|non|verǫld}}.<ref>Orel, Vladimir (2003) ''A Handbook of Germanic Etymology'' Leiden: Brill. p. 462 {{ISBN|90-04-12875-1}}.</ref>

The corresponding word in [[Latin]] is {{Lang|la|mundus}}, literally 'clean, elegant', itself a [[Calque|loan translation]] of Greek ''[[cosmos]]'' 'orderly arrangement'. While the Germanic word thus reflects a mythological notion of a "domain of Man" (compare [[Midgard]]), presumably as opposed to the divine sphere on the one hand and the [[chthonic]] sphere of the underworld on the other, the Greco-Latin term expresses a notion of [[Creation myth|creation]] as an act of establishing order out of [[chaos (cosmogony)|chaos]].<ref name="Lewis" />

== Conceptions ==
Different fields often work with quite different conceptions of the essential features associated with the term "world".<ref name="Sandkühler">{{cite book |last1=Sandkühler |first1=Hans Jörg |title=Enzyklopädie Philosophie |date=2010 |publisher=Meiner |url=https://meiner.de/enzyklopadie-philosophie.html |chapter=Welt}}</ref><ref name="Mittelstraß">{{cite book |last1=Mittelstraß |first1=Jürgen |title=Enzyklopädie Philosophie und Wissenschaftstheorie |date=2005 |publisher=Metzler |url=https://www.springer.com/de/book/9783476021083 |chapter=Welt|isbn=978-3-476-02108-3 }}</ref> Some conceptions see the world as unique: there can be no more than one world. Others talk of a "plurality of worlds".<ref name="Lewis">{{cite book |last1=Lewis |first1=David |title=On the Plurality of Worlds |date=1986 |publisher=Wiley-Blackwell |url=https://philpapers.org/rec/LEWOTP-3}}</ref> Some see worlds as complex things composed of many substances as their parts while others hold that worlds are simple in the sense that there is only one substance: the world as a whole.<ref name="Schaffer">{{cite web |last1=Schaffer |first1=Jonathan |title=Monism |url=https://plato.stanford.edu/entries/monism/ |website=The Stanford Encyclopedia of Philosophy |publisher=Metaphysics Research Lab, Stanford University |access-date=8 April 2021 |date=2018}}</ref> Some characterize worlds in terms of objective spacetime while others define them relative to the horizon present in each experience. These different characterizations are not always exclusive: it may be possible to combine some without leading to a contradiction. Most of them agree that worlds are unified totalities.<ref name="Sandkühler"/><ref name="Mittelstraß"/>

=== Monism and pluralism ===
[[Monism]] is a thesis about oneness: that only one thing exists in a certain sense. The denial of monism is [[Pluralism (philosophy)|pluralism]], the thesis that, in a certain sense, more than one thing exists.<ref name="Schaffer"/> There are many forms of monism and pluralism, but in relation to the world as a whole, two are of special interest: existence monism/pluralism and priority monism/pluralism. Existence monism states that the world is the only concrete object there is.<ref name="Schaffer"/><ref>{{cite journal |last1=Schaffer |first1=Jonathan |title=From Nihilism to Monism |journal=Australasian Journal of Philosophy |date=2007 |volume=85 |issue=2 |pages=175–191 |doi=10.1080/00048400701343150 |s2cid=7788506 |url=https://philpapers.org/rec/SCHFNT |issn = 0004-8402}}</ref><ref name="Sider">{{cite journal |last1=Sider |first1=Theodore |title=Against Monism |journal=Analysis |date=2007 |volume=67 |issue=1 |pages=1–7 |doi=10.1111/j.1467-8284.2007.00641.x |url=https://philpapers.org/rec/SIDAM}}</ref> This means that all the concrete "objects" we encounter in our daily lives, including apples, cars and ourselves, are not truly objects in a strict sense. Instead, they are just dependent aspects of the world-object.<ref name="Schaffer"/> Such a world-object is simple in the sense that it does not have any genuine parts. For this reason, it has also been referred to as "blobject" since it lacks an internal structure like a blob.<ref>{{cite journal |last1=Horgan |first1=Terry |last2=Potr |first2=Matja |title=Blobjectivism and Indirect Correspondence |journal=Facta Philosophica |date=2000 |volume=2 |issue=2 |pages=249–270 |doi=10.5840/factaphil20002214 |s2cid=15340589 |url=https://philpapers.org/rec/HORBAI}}</ref> Priority monism allows that there are other concrete objects besides the world.<ref name="Schaffer"/> But it holds that these objects do not have the most fundamental form of existence, that they somehow depend on the existence of the world.<ref name="Sider"/><ref>{{cite journal |last1=Steinberg |first1=Alex |title=Priority Monism and Part/Whole Dependence |journal=Philosophical Studies |date=2015 |volume=172 |issue=8 |pages=2025–2031 |doi=10.1007/s11098-014-0395-8 |s2cid=170436138 |url=https://philpapers.org/rec/STEPMA-2}}</ref> The corresponding forms of pluralism state that the world is complex in the sense that it is made up of concrete, independent objects.<ref name="Schaffer"/>

=== Scientific cosmology ===
Scientific cosmology can be defined as the science of the universe as a whole. In it, the terms "[[universe]]" and "[[cosmos]]" are usually used as synonyms for the term "world".<ref>{{cite book |last1=Bolonkin |first1=Alexander |title=Universe, Human Immortality and Future Human Evaluation |date=26 December 2011 |publisher=Elsevier |isbn=978-0-12-415801-6 |page=3 |url=https://books.google.com/books?id=TuWQx58ZnPsC |language=en}}</ref> One common definition of the world/universe found in this field is as "[t]he totality of all space and time; all that is, has been, and will be".<ref>{{cite book |last1=Zeilik |first1=Michael |last2=Gregory |first2=Stephen A. |title=Introductory Astronomy & Astrophysics |publisher=Saunders College Pub. |isbn=978-0-03-006228-5 |url=https://books.google.com/books?id=iH7vAAAAMAAJ |language=en |chapter=Glossary|year=1998 }}</ref><ref name="Sandkühler"/><ref name="Mittelstraß"/> Some definitions emphasize that there are two other aspects to the universe besides spacetime: forms of energy or matter, like stars and particles, and laws of nature.<ref name="Duco">{{cite book |last1=Schreuder |first1=Duco A. |title=Vision and Visual Perception |date=3 December 2014 |publisher=Archway Publishing |isbn=978-1-4808-1294-9 |page=135 |url=https://books.google.com/books?id=I7a7BQAAQBAJ |language=en}}</ref> World-conceptions in this field differ both concerning their notion of spacetime and of the contents of spacetime. The [[theory of relativity]] plays a central role in modern cosmology and its conception of space and time. A difference from its predecessors is that it conceives space and time not as distinct dimensions but as a single four-dimensional manifold called [[spacetime]].<ref name="Fraassen">{{cite journal |last1=Fraassen |first1=Bas C. van |title='World' is Not a Count Noun |journal=Noûs |date=1995 |volume=29 |issue=2 |pages=139–157 |doi=10.2307/2215656 |jstor=2215656 |url=https://philpapers.org/rec/VANWIN}}</ref> This can be seen in [[special relativity]] in relation to the [[Minkowski metric]], which includes both spatial and temporal components in its definition of distance.<ref name="Zeilik25"/> [[General relativity]] goes one step further by integrating the concept of [[mass]] into the concept of spacetime as its curvature.<ref name="Zeilik25">{{cite book |last1=Zeilik |first1=Michael |last2=Gregory |first2=Stephen A. |title=Introductory Astronomy & Astrophysics |publisher=Saunders College Pub. |isbn=978-0-03-006228-5 |url=https://books.google.com/books?id=iH7vAAAAMAAJ |language=en |chapter=25. Cosmology: The Big Bang and Beyond|year=1998 }}</ref> [[Quantum cosmology]] uses a classical notion of spacetime and conceives the whole world as one big [[wave function]] expressing the probability of finding particles in a given location.<ref>{{cite journal|last1=Dongshan |first1=He |last2=Dongfeng |first2=Gao |last3=Qing-yu |first3=Cai |title=Spontaneous creation of the universe from nothing |journal=Physical Review D |year=2014 |volume=89 |issue=8 |article-number=083510 |doi=10.1103/PhysRevD.89.083510 |arxiv=1404.1207 |bibcode=2014PhRvD..89h3510H |s2cid=118371273 }}</ref>

=== Theories of modality ===
The world-concept plays a role in many modern theories of modality, sometimes in the form of [[possible worlds]].<ref>{{cite web |last1=Parent |first1=Ted |title=Modal Metaphysics |url=https://iep.utm.edu/mod-meta/ |website=Internet Encyclopedia of Philosophy |access-date=9 April 2021}}</ref> A possible world is a complete and consistent way how things could have been.<ref name="Menzel">{{cite web |last1=Menzel |first1=Christopher |title=Possible Worlds |url=https://plato.stanford.edu/entries/possible-worlds/ |website=The Stanford Encyclopedia of Philosophy |publisher=Metaphysics Research Lab, Stanford University |access-date=9 April 2021 |date=2017}}</ref> The actual world is a possible world since the way things are is a way things could have been. There are many other ways things could have been besides how they actually are. For example, Hillary Clinton did not win the 2016 US election, but she could have won them. So there is a possible world in which she did. There is a vast number of possible worlds, one corresponding to each such difference, no matter how small or big, as long as no outright contradictions are introduced this way.<ref name="Menzel"/>

Possible worlds are often conceived as abstract objects, for example, in terms of non-obtaining [[states of affairs]] or as maximally consistent sets of propositions.<ref>{{cite journal |last1=Jacquette |first1=Dale |title=Propositions, Sets, and Worlds |journal=Studia Logica |date=1 April 2006 |volume=82 |issue=3 |pages=337–343 |doi=10.1007/s11225-006-8101-2 |s2cid=38345726 |url=https://link.springer.com/article/10.1007/s11225-006-8101-2 |language=en |issn=1572-8730|url-access=subscription }}</ref><ref>{{cite web |last1=Menzel |first1=Christopher |title=Possible Worlds > Problems with Abstractionism |url=https://plato.stanford.edu/entries/possible-worlds/problems-abstractionism.html |website=Stanford Encyclopedia of Philosophy |access-date=9 April 2021}}</ref> On such a view, they can even be seen as belonging to the actual world.<ref>{{cite web |last1=Menzel |first1=Christopher |title=Actualism > An Account of Abstract Possible Worlds |url=https://plato.stanford.edu/entries/actualism/possible-worlds.html |website=Stanford Encyclopedia of Philosophy |access-date=9 April 2021}}</ref> Another way to conceive possible worlds, made famous by [[David Lewis (philosopher)|David Lewis]], is as concrete entities.<ref name="Lewis"/> On this conception, there is no important difference between the actual world and possible worlds: both are conceived as concrete, inclusive and spatiotemporally connected.<ref name="Menzel"/> The only difference is that the actual world is the world ''we'' live in, while other possible worlds are not inhabited by us but by our ''counterparts''.<ref name="Bricker">{{cite journal |last1=Bricker |first1=Phillip |title=David Lewis: On the Plurality of Worlds |journal=Central Works of Philosophy, Vol. 5: The Twentieth Century: Quine and After |date=2006 |pages=246–267 |url=https://philpapers.org/rec/BRIDLO |publisher=Acumen Publishing|doi=10.1017/UPO9781844653621.014 |isbn=978-1-84465-362-1 }}</ref> Everything within a world is spatiotemporally connected to everything else but the different worlds do not share a common spacetime: They are spatiotemporally isolated from each other.<ref name="Menzel"/> This is what makes them separate worlds.<ref name="Bricker"/>

It has been suggested that, besides possible worlds, there are also impossible worlds. Possible worlds are ''ways things could have been'', so impossible worlds are ''ways things could not have been''.<ref name="Berto">{{cite web |last1=Berto |first1=Francesco |last2=Jago |first2=Mark |title=Impossible Worlds |url=https://plato.stanford.edu/entries/impossible-worlds/ |website=The Stanford Encyclopedia of Philosophy |publisher=Metaphysics Research Lab, Stanford University |date=2018}}</ref><ref>{{cite journal |last1=Zalta |first1=Edward N. |title=A Classically-Based Theory of Impossible Worlds |journal=Notre Dame Journal of Formal Logic |date=1997 |volume=38 |issue=4 |pages=640–660 |doi=10.1305/ndjfl/1039540774 |url=https://philpapers.org/rec/ZALACT|doi-access=free }}</ref> Such worlds involve a contradiction, like a world in which Hillary Clinton both won and lost the 2016 US election. Both possible and impossible worlds have in common the idea that they are totalities of their constituents.<ref name="Berto"/><ref>{{cite book |last1=Ryan |first1=Marie-Laure |title=Immersion and Distance |date=2013 |publisher=Brill Rodopi |isbn=978-94-012-0924-3 |url=https://brill.com/view/book/edcoll/9789401209243/B9789401209243-s006.xml |language=en |chapter=Impossible Worlds and Aesthetic Illusion}}</ref>

=== Phenomenology ===
Within [[Phenomenology (philosophy)|phenomenology]], worlds are defined in terms of ''horizons'' of experiences.<ref name="Sandkühler"/><ref name="Mittelstraß"/> When we perceive an object, like a house, we do not just experience this object at the center of our attention but also various other objects surrounding it, given in the periphery.<ref name="Embree">{{cite book |last1=Embree |first1=Lester |title=Encyclopedia of Phenomenology |date=1997 |publisher=Kluwer Academic Publishers |url=https://philpapers.org/rec/EMBEOP |chapter=World}}</ref> The term "horizon" refers to these co-given objects, which are usually experienced only in a vague, indeterminate manner.<ref>{{cite web |last1=Smith |first1=David Woodruff |title=Phenomenology |url=https://plato.stanford.edu/entries/phenomenology/ |website=The Stanford Encyclopedia of Philosophy |publisher=Metaphysics Research Lab, Stanford University |access-date=9 April 2021 |date=2018}}</ref><ref>{{cite web |last1=Smith |first1=Joel |title=Phenomenology |url=https://iep.utm.edu/phenom/ |website=Internet Encyclopedia of Philosophy |access-date=9 April 2021}}</ref> The perception of a house involves various horizons, corresponding to the neighborhood, the city, the country, the Earth, etc. In this context, the world is the biggest horizon or the "horizon of all horizons".<ref name="Embree"/><ref name="Sandkühler"/><ref name="Mittelstraß"/> It is common among phenomenologists to understand the world not just as a spatiotemporal collection of objects but as additionally incorporating various other relations between these objects. These relations include, for example, indication-relations that help us anticipate one object given the appearances of another object and means-end-relations or functional involvements relevant for practical concerns.<ref name="Embree"/>

=== Philosophy of mind ===
In [[philosophy of mind]], the term "world" is commonly used in contrast to the term "mind" as that which is represented by the mind. This is sometimes expressed by stating that there is a gap between mind and world and that this gap needs to be overcome for representation to be successful.<ref name="Price">{{cite journal |last1=Price |first1=Huw |last2=McDowell |first2=John |title=Mind and World |journal=Philosophical Books |date=1994 |volume=38 |issue=3 |pages=169–181 |doi=10.1111/1468-0149.00066 |url=https://philpapers.org/rec/HUWMAW}}</ref><ref>{{cite web |last1=Avramides |first1=Anita |title=Philosophy of Mind: Overview |url=https://www.encyclopedia.com/history/dictionaries-thesauruses-pictures-and-press-releases/philosophy-mind-overview |website=www.encyclopedia.com |access-date=10 April 2021}}</ref><ref>{{cite web |last1=Witmer |first1=D. Gene |title=Philosophy Of Mind |url=https://www.encyclopedia.com/history/biographies/spanish-and-portuguese-history-biographies/philosophy-mind |website=www.encyclopedia.com |access-date=10 April 2021}}</ref> One problem in philosophy of mind is to explain how the mind is able to bridge this gap and to enter into genuine mind-world-relations, for example, in the form of perception, knowledge or action.<ref>{{cite web |title=Philosophy of mind |url=https://www.britannica.com/topic/philosophy-of-mind |website=Encyclopedia Britannica |access-date=10 April 2021 |language=en}}</ref><ref>{{cite journal |last1=Sosa |first1=Ernest |title=Mind-World Relations |journal=Episteme |date=2015 |volume=12 |issue=2 |pages=155–166 |doi=10.1017/epi.2015.8 |s2cid=147785165 |url=https://philpapers.org/go.pl?id=SOSMR&proxyId=&u=http%3A%2F%2Fdx.doi.org%2F10.1017%2Fepi.2015.8 |language=en |issn=1742-3600}}</ref> This is necessary for the world to be able to rationally constrain the activity of the mind.<ref name="Price"/><ref name="Brandom">{{cite journal |last1=Brandom |first1=Robert B. |title=Perception and Rational Constraint: McDowell's Mind and World |journal=Philosophical Issues |date=1996 |volume=7 |pages=241–259 |doi=10.2307/1522910 |jstor=1522910 |url=https://philpapers.org/rec/BRAPAR}}</ref> According to a realist position, the world is something distinct and independent from the mind.<ref name="Miller">{{cite web |last1=Miller |first1=Alexander |title=Realism |url=https://plato.stanford.edu/entries/realism/ |website=The Stanford Encyclopedia of Philosophy |publisher=Metaphysics Research Lab, Stanford University |date=2019}}</ref> Idealists conceive of the world as partially or fully determined by the mind.<ref name="Miller"/><ref>{{cite web |last1=Guyer |first1=Paul |last2=Horstmann |first2=Rolf-Peter |title=Idealism |url=https://plato.stanford.edu/entries/idealism/ |website=The Stanford Encyclopedia of Philosophy |publisher=Metaphysics Research Lab, Stanford University |access-date=10 April 2021 |date=2021}}</ref> [[Immanuel Kant]]'s [[transcendental idealism]], for example, posits that the spatiotemporal structure of the world is imposed by the mind on reality but lacks independent existence otherwise.<ref>{{cite web |author-link1=Nicholas Stang|last1=Stang |first1=Nicholas F. |title=Kant's Transcendental Idealism |url=https://plato.stanford.edu/entries/kant-transcendental-idealism/ |website=The Stanford Encyclopedia of Philosophy |publisher=Metaphysics Research Lab, Stanford University |access-date=10 April 2021 |date=2021}}</ref> A more radical idealist conception of the world can be found in Berkeley's [[subjective idealism]], which holds that the world as a whole, including all everyday objects like tables, cats, trees and ourselves, "consists of nothing but minds and ideas".<ref>{{cite web |last1=Flage |first1=Daniel E. |title=Berkeley, George |url=https://iep.utm.edu/berkeley/ |website=Internet Encyclopedia of Philosophy |access-date=10 April 2021}}</ref>

=== Theology ===
Different theological positions hold different conceptions of the world based on its relation to God. [[Classical theism]] states that God is wholly distinct from the world. But the world depends for its existence on God, both because God created the world and because He maintains or conserves it.<ref name="Leftow">{{cite web |last1=Leftow |first1=Brian |title=God, concepts of: Classical theism |url=https://www.rep.routledge.com/articles/thematic/god-concepts-of/v-1/sections/classical-theism |website=www.rep.routledge.com |access-date=12 April 2021 |language=en}}</ref><ref name="Britannica">{{cite web |title=Theism |url=https://www.britannica.com/topic/theism |website=Encyclopedia Britannica |access-date=12 April 2021 |language=en}}</ref><ref name="Culp">{{cite web |last1=Culp |first1=John |title=Panentheism |url=https://plato.stanford.edu/entries/panentheism/ |website=The Stanford Encyclopedia of Philosophy |publisher=Metaphysics Research Lab, Stanford University |access-date=12 April 2021 |date=2020}}</ref> This is sometimes understood in analogy to how humans create and conserve ideas in their imagination, with the difference being that the divine mind is vastly more powerful.<ref name="Leftow"/> On such a view, God has absolute, ultimate reality in contrast to the lower ontological status ascribed to the world.<ref name="Culp"/> God's involvement in the world is often understood along the lines of a personal, benevolent God who looks after and guides His creation.<ref name="Britannica"/> [[Deism|Deists]] agree with theists that God created the world but deny any subsequent, personal involvement in it.<ref>{{cite web |title=Deism |url=https://www.britannica.com/topic/Deism |website=Encyclopedia Britannica |access-date=12 April 2021 |language=en}}</ref> [[Pantheism|Pantheists]] reject the separation between God and world. Instead, they claim that the two are identical. This means that there is nothing to the world that does not belong to God and that there is nothing to God beyond what is found in the world.<ref name="Culp"/><ref>{{cite web |last1=Leftow |first1=Brian |title=God, concepts of: Pantheism |url=https://www.rep.routledge.com/articles/thematic/god-concepts-of/v-1/sections/pantheism |website=www.rep.routledge.com |language=en}}</ref> [[Panentheism]] constitutes a middle ground between theism and pantheism. Against theism, it holds that God and the world are interrelated and depend on each other. Against pantheism, it holds that there is no outright identity between the two.<ref name="Culp"/><ref>{{cite web |last1=Leftow |first1=Brian |title=God, concepts of: Panentheism |url=https://www.rep.routledge.com/articles/thematic/god-concepts-of/v-1/sections/panentheism |website=www.rep.routledge.com |language=en}}</ref>

== History of philosophy ==
In philosophy, the term ''world'' has several possible meanings. In some contexts, it refers to everything that makes up [[reality]] or the physical [[universe]]. In others, it can mean have a specific [[ontology|ontological]] sense (see [[world disclosure]]). While clarifying the [[concept]] of world has arguably always been among the basic tasks of [[Western philosophy]], this theme appears to have been raised explicitly only at the start of the twentieth century,<ref>{{cite book|last=Heidegger|first=Martin|title=Basic Problems of Phenomenology|location=Bloomington|publisher=Indiana University Press|year=1982 |page=[https://archive.org/details/basicproblemsofp00mart/page/165 165]|isbn=0-253-17686-7|url-access=registration|url=https://archive.org/details/basicproblemsofp00mart/page/165}}</ref>

=== Plato ===
[[Plato]] is well known for his [[theory of forms]], which posits the existence of two different worlds: the sensible world and the intelligible world. The sensible world is the world we live in, filled with changing physical things we can see, touch and interact with. The intelligible world is the world of invisible, eternal, changeless forms like goodness, beauty, unity and sameness.<ref name="Kraut">{{cite web |last1=Kraut |first1=Richard |title=Plato |url=https://plato.stanford.edu/entries/plato/ |website=The Stanford Encyclopedia of Philosophy |publisher=Metaphysics Research Lab, Stanford University |access-date=24 April 2021 |date=2017}}</ref><ref name="Brickhouse">{{cite web |last1=Brickhouse |first1=Thomas |last2=Smith |first2=Nicholas D. |title=Plato: 6b. The Theory of Forms |url=https://iep.utm.edu/plato/#SH6b |website=Internet Encyclopedia of Philosophy |access-date=24 April 2021}}</ref><ref name="Nehamas">{{cite journal |last1=Nehamas |first1=Alexander |title=Plato on the Imperfection of the Sensible World |journal=American Philosophical Quarterly |date=1975 |volume=12 |issue=2 |pages=105–117 |jstor=20009565 |issn=0003-0481}}</ref> Plato ascribes a lower ontological status to the sensible world, which only imitates the world of forms. This is due to the fact that physical things exist only to the extent that they participate in the forms that characterize them, while the forms themselves have an independent manner of existence.<ref name="Kraut"/><ref name="Brickhouse"/><ref name="Nehamas"/> In this sense, the sensible world is a mere replication of the perfect exemplars found in the world of forms: it never lives up to the original. In the [[allegory of the cave]], Plato compares the physical things we are familiar with to mere shadows of the real things. But not knowing the difference, the prisoners in the cave mistake the shadows for the real things.<ref>{{cite web |last1=Partenie |first1=Catalin |title=Plato's Myths |url=https://plato.stanford.edu/entries/plato-myths/ |website=The Stanford Encyclopedia of Philosophy |publisher=Metaphysics Research Lab, Stanford University |access-date=24 April 2021 |date=2018}}</ref>

=== Wittgenstein ===
Two definitions that were both put forward in the 1920s, however, suggest the range of available opinion. "The world is everything that is the case", wrote [[Ludwig Wittgenstein]] in his influential ''[[Tractatus Logico-Philosophicus]]'', first published in 1921.<ref>{{cite web|url=https://plato.stanford.edu/entries/wittgenstein/|title=Ludwig Wittgenstein|publisher=Stanford Encyclopedia of Philosophy |editor-last=Zalta|editor-first=Edward N.|date=3 March 2014|access-date=3 December 2017|first1=Anat|first2=Anat|last1=Biletzki|last2=Matar|edition=Fall 2016}}</ref>

=== Heidegger ===
[[Martin Heidegger]], meanwhile, argued that "the surrounding world is different for each of us, and notwithstanding that we move about in a common world".<ref>Heidegger (1982), p. 164.</ref>

=== Eugen Fink ===
"World" is one of the key terms in [[Eugen Fink]]'s philosophy.<ref>{{cite journal |last1=Elden |first1=Stuart |title=Eugen Fink and the Question of the World |journal=Parrhesia: A Journal of Critical Philosophy |date=2008 |volume=5 |pages=48–59 |url=https://philpapers.org/rec/ELDEFA}}</ref> He thinks that there is a misguided tendency in western philosophy to understand the world as one enormously big thing containing all the small everyday things we are familiar with.<ref name="Homan">{{cite journal |last1=Homan |first1=Catherine |title=The Play of Ethics in Eugen Fink |journal=Journal of Speculative Philosophy |date=2013 |volume=27 |issue=3 |pages=287–296 |doi=10.5325/jspecphil.27.3.0287 |s2cid=142401048 |url=https://philpapers.org/rec/HOMTPO-2}}</ref> He sees this view as a form of forgetfulness of the world and tries to oppose it by what he calls the "cosmological difference": the difference between the world and the inner-worldly things it contains.<ref name="Homan"/> On his view, the world is the totality of the inner-worldly things that transcends them.<ref name="Halák2">{{cite journal |last1=Halák |first1=Jan |title=Beyond Things: The Ontological Importance of Play According to Eugen Fink |journal=Journal of the Philosophy of Sport |date=2016 |volume=43 |issue=2 |pages=199–214 |doi=10.1080/00948705.2015.1079133 |s2cid=146382154 |url=https://philpapers.org/rec/HALBTT-3}}</ref> It is itself groundless but it provides a ground for things. It therefore cannot be identified with a mere container. Instead, the world gives appearance to inner-worldly things, it provides them with a place, a beginning and an end.<ref name="Homan"/> One difficulty in investigating the world is that we never encounter it since it is not just one more thing that appears to us. This is why Fink uses the notion of play or playing to elucidate the nature of the world.<ref name="Homan"/><ref name="Halák2"/> He sees play as a symbol of the world that is both part of it and that represents it.<ref name="Halák">{{cite journal |last1=Halák |first1=Jan |title=Towards the World: Eugen Fink on the Cosmological Value of Play |journal=Sport, Ethics and Philosophy |date=2015 |volume=9 |issue=4 |pages=401–412 |doi=10.1080/17511321.2015.1130740 |s2cid=146764077 |url=https://philpapers.org/rec/HALTTW-2}}</ref> Play usually comes with a form of imaginary play-world involving various things relevant to the play. But just like the play is more than the imaginary realities appearing in it so the world is more than the actual things appearing in it.<ref name="Homan"/><ref name="Halák"/>

=== Goodman ===
The concept of worlds plays a central role in [[Nelson Goodman]]'s late philosophy.<ref name="Declos"/> He argues that we need to posit different worlds in order to account for the fact that there are different incompatible truths found in reality.<ref name="Cohnitz">{{cite web |last1=Cohnitz |first1=Daniel |last2=Rossberg |first2=Marcus |title=Nelson Goodman: 6. Irrealism and Worldmaking |url=https://plato.stanford.edu/entries/goodman/#IrrWor |website=The Stanford Encyclopedia of Philosophy |publisher=Metaphysics Research Lab, Stanford University |access-date=15 April 2021 |date=2020}}</ref> Two truths are incompatible if they ascribe incompatible properties to the same thing.<ref name="Declos"/> This happens, for example, when we assert both that the earth moves and that the earth is at rest. These incompatible truths correspond to two different ways of describing the world: [[heliocentrism]] and [[geocentrism]].<ref name="Cohnitz"/> Goodman terms such descriptions "world versions". He holds a [[correspondence theory of truth]]: a world version is true if it corresponds to a world. Incompatible true world versions correspond to different worlds.<ref name="Cohnitz"/> It is common for theories of modality to posit the existence of a plurality of possible worlds. But Goodman's theory is different since it posits a plurality not of possible but of actual worlds.<ref name="Declos"/><ref name="Sandkühler"/> Such a position is in danger of involving a contradiction: there cannot be a plurality of actual worlds if worlds are defined as maximally inclusive wholes.<ref name="Declos"/><ref name="Sandkühler"/> This danger may be avoided by interpreting Goodman's world-concept not as maximally inclusive wholes in the absolute sense but in relation to its corresponding world-version: a world contains all and only the entities that its world-version describes.<ref name="Declos"/><ref name="Sandkühler"/>

== Religion ==
[[File:yggdrasil.jpg|thumb|270px|right|upright=1.35|[[Yggdrasil]], an attempt to reconstruct the Norse [[world tree]] which connects the [[heaven]]s, the world, and the [[underworld]].]]

[[Religious cosmology|Mythological cosmologies]] depict the world as centered on an ''[[axis mundi]]'' and delimited by a boundary such as a [[Oceanus|world ocean]], a [[Jörmungandr|world serpent]] or similar.<ref>Hemer, C. J. "Worldly" Edited by Geoffrey W. Bromiley The International Standard Bible Encyclopedia, Revised Wm. B. Eerdmans, 1979–1988</ref><ref>{{cite book|title=Oxford English Dictionary Online|publisher=Oxford University Press|year=2019|via=OED Online}}</ref>

=== Hinduism ===
Hinduism constitutes a family of religious-philosophical views.<ref name="Ranganathan"/> These views present perspectives on the nature and role of the world. [[Samkhya]] philosophy, for example, is a metaphysical dualism that understands reality as comprising 2 parts: [[purusha]] and [[prakriti]].<ref name="Ruzsa"/> The term "purusha" stands for the individual conscious self that each of "us" possesses. Prakriti, on the other hand, is the 1 world inhabited by all these selves.<ref name="Britannica2"/> Samkhya understands this world as a world of matter governed by the law of cause and effect.<ref name="Ruzsa"/> The term "matter" is understood in a sense in this tradition including physical and mental aspects.<ref name="Parrot"/> This is reflected in the doctrine of [[tattva]]s, according to which prakriti is made up of 23 principles or elements of reality.<ref name="Parrot">{{cite journal |last1=Parrot |first1=Rodney J. |title=The Problem of the Sāṃkhya Tattvas as Both Cosmic and Psychological Phenomena |journal=Journal of Indian Philosophy |date=1986 |volume=14 |issue=1 |pages=55–77 |jstor=23444164 |issn=0022-1791}}</ref> These principles include physical elements, like water or earth, and mental aspects, like intelligence or sense-impressions.<ref name="Britannica2">{{cite web |title=Indian philosophy - The Samkhya-karikas |url=https://www.britannica.com/topic/Indian-philosophy/The-Samkhya-karikas#ref61595 |website=Encyclopedia Britannica |access-date=15 April 2021 |language=en}}</ref> The relation between purusha and prakriti is conceived as 1 of observation: purusha is the conscious self aware of the world of prakriti and does not causally interact with it.<ref name="Ruzsa">{{cite web |last1=Ruzsa |first1=Ferenc |title=Sankhya |url=https://iep.utm.edu/sankhya/ |website=Internet Encyclopedia of Philosophy |access-date=15 April 2021}}</ref>

A conception of the world is present in [[Advaita Vedanta]], the monist school among the [[Vedanta]] schools.<ref name="Ranganathan">{{cite web |last1=Ranganathan |first1=Shyam |title=Hindu Philosophy |url=https://iep.utm.edu/hindu-ph |website=Internet Encyclopedia of Philosophy |access-date=15 April 2021}}</ref> Unlike the realist position defended in Samkhya philosophy, Advaita Vedanta sees the world of multiplicity as an illusion, referred to as [[Maya (religion)|Maya]].<ref name="Ranganathan"/> This illusion includes impression of existing as separate experiencing selfs called [[Jiva]]s.<ref name="Menon"/> Instead, Advaita Vedanta teaches that on the most fundamental level of reality, referred to as [[Brahman]], there exists no plurality or difference.<ref name="Menon"/> All there is <!-- double "is" is not a grammatical error --> is 1 all-encompassing self: [[Ātman (Hinduism)|Atman]].<ref name="Ranganathan"/> Ignorance is seen as the source of this illusion, which results in bondage to the world of mere appearances. Liberation is possible in the course of overcoming this illusion by acquiring the knowledge of Brahman, according to Advaita Vedanta.<ref name="Menon">{{cite web |last1=Menon |first1=Sangeetha |title=Vedanta, Advaita |url=https://iep.utm.edu/adv-veda/ |website=Internet Encyclopedia of Philosophy |access-date=15 April 2021}}</ref>

=== Christianity ===
[[Contemptus mundi]] is the name given to the belief that the world, in all its vanity, is nothing more than a futile attempt to hide from God by stifling our desire for the good and the holy.<ref>{{Cite web|url=http://www.chastitysf.com/q_cm.htm|archive-url=https://web.archive.org/web/20110708140237/http://www.chastitysf.com/q_cm.htm|title=Contemptus Mundi: Contempt of the world &#124; Catholic Christian Healing Psychology|archive-date=8 July 2011|website=www.chastitysf.com}}</ref> This view has been characterised as a "pastoral of fear" by historian [[Jean Delumeau]].<ref>{{Cite web|url=http://www.ewtn.com/library/montfort/Handbook/Mission.htm|archive-url=https://web.archive.org/web/20110605035017/http://www.ewtn.com/library/montfort/Handbook/Mission.htm|title=Parish Missions|archive-date=5 June 2011}}</ref> "[[The world, the flesh, and the devil]]" is a traditional division of the sources of [[temptation]].<ref name="Zuhlsdorf-2019">{{cite web |last1=Zuhlsdorf |first1=John |title=The meaning of 'The world, the flesh and the Devil' |url=https://catholicherald.co.uk/omnium-gatherum-161/ |website=Catholic Herald |access-date=12 August 2021 |date=14 March 2019}}</ref>

{{lang|la|Orbis Catholicus}} is a Latin phrase meaning "Catholic world", per the expression ''[[Urbi et Orbi]]'', and refers to that area of [[Christendom]] under [[papal supremacy]].<ref>{{cite book|last=Marty|first=Martin|url=https://books.google.com/books?id=MoolUlqQdmAC|title=The Christian World: A Global History|publisher=Random House Publishing Group|year=2008|isbn=978-1-58836-684-9|page=42}}</ref>

=== Islam ===
{{Main|Dunya}}
In Islam, the term "dunya" is used for the world. Its meaning is derived from the root word "dana", a term for "near".<ref>Attas, Islam and Secularism{{Page needed|date=July 2023}}</ref> It is associated with the temporal, sensory world and earthly concerns, i.e. with ''this world'' in contrast to the ''spiritual world''.<ref name="Concise">{{cite book |title=Concise Encyclopaedia of Islam: Edited on Behalf of the Royal Netherlands Academy. Fourth Impression |date=2001 |publisher=Brill |isbn=978-0-391-04116-5 |url=https://brill.com/view/title/7552 |language=en |chapter=dunyâ}}</ref> Religious teachings warn of a tendency to seek happiness in ''this world'' and advise a more ascetic lifestyle concerned with the afterlife.<ref>{{cite book |last1=Oktar |first1=Adnan |title=The Truth of the Life of This World |date=1999 |url=https://harun-yahya.net/en/books/1001/The-Truth-of-the-Life-of-This-World/chapter/2681/Mans-True-Abode-Hereafter |chapter=Man's True Abode: Hereafter}}</ref> Other strands in Islam recommend a balanced approach.<ref name="Concise"/>

=== Mandaeism ===
In [[Mandaean cosmology]], the world or earthly realm is known as [[Tibil]]. It is separated from the World of Light ({{transliteration|myz|alma d-nhūra}}) above and the World of Darkness ({{transliteration|myz|alma d-hšuka}}) below by [[aether (classical element)|aether]] ({{transliteration|myz|ayar}}).<ref name="Aldihisi 2008">{{cite thesis|url=https://discovery.ucl.ac.uk/id/eprint/1444088/|last=Aldihisi|first=Sabah|year=2008|title=The story of creation in the Mandaean holy book in the Ginza Rba|type=PhD|publisher=University College London}}</ref><ref name="Buckley 2002">{{cite book|last=Buckley|first=Jorunn Jacobsen|title=The Mandaeans: ancient texts and modern people|publisher=Oxford University Press|publication-place=New York|year=2002|isbn=0-19-515385-5|oclc=65198443}}</ref>

== Related terms and problems ==
=== Worldviews ===
{{main|Worldview}}
[[File:Home in Relation to Everything.png|thumb|Scientific [[worldview]].]]
A worldview is a comprehensive representation of the world and our place in it.<ref name="McIvor">{{cite book |last1=McIvor |first1=David W. |title=International Encyclopedia of the Social Sciences |url=https://www.encyclopedia.com/philosophy-and-religion/philosophy/philosophy-terms-and-concepts/worldview-philosophy |chapter=Weltanschauung}}</ref> As a representation, it is a subjective perspective of the world and thereby different from the world it represents.<ref name="Bunge">{{cite book |last1=Bunge |first1=Mario |title=Matter and Mind: A Philosophical Inquiry |publisher=Springer Verlag |url=https://philpapers.org/rec/BUNMAM |chapter=1. Philosophy as Worldview|year=2010 }}</ref> All higher animals need to represent their environment in some way in order to navigate it. But it has been argued that only humans possess a representation encompassing enough to merit the term "worldview".<ref name="Bunge"/> Philosophers of worldviews commonly hold that the understanding of any object depends on a worldview constituting the background on which this understanding can take place. This may affect not just our intellectual understanding of the object in question but the experience of it in general.<ref name="McIvor"/> It is therefore impossible to assess one's worldview from a neutral perspective since this assessment already presupposes the worldview as its background. Some hold that each worldview is based on a single hypothesis that promises to solve all the problems of our existence we may encounter.<ref name="De Mijolla-Mellor">{{cite book |last1=De Mijolla-Mellor |first1=Sophie |title=International Dictionary of Psychoanalysis |url=https://www.encyclopedia.com/philosophy-and-religion/philosophy/philosophy-terms-and-concepts/worldview-philosophy |chapter=Weltanschauung}}</ref> On this interpretation, the term is closely associated to the worldviews given by different religions.<ref name="De Mijolla-Mellor"/> Worldviews offer orientation not just in theoretical matters but also in practical matters. For this reason, they usually include answers to the question of the meaning of life and other evaluative components about what matters and how we should act.<ref>{{cite book |last1=MARSHALL |first1=GORDON |title=A Dictionary of Sociology |url=https://www.encyclopedia.com/philosophy-and-religion/philosophy/philosophy-terms-and-concepts/worldview-philosophy |chapter=Weltanschauung}}</ref><ref>{{cite journal |last1=Weber |first1=Erik |title=Introduction |journal=Foundations of Science |date=1998 |volume=3 |issue=2 |pages=231–234 |doi=10.1023/A:1009669806878 |url=https://philpapers.org/rec/WEBI}}</ref> A worldview can be unique to one individual but worldviews are usually shared by many people within a certain culture or religion.

=== Paradox of many worlds ===
The idea that there exist many different worlds is found in various fields. For example, theories of modality talk about a plurality of possible worlds and the [[many-worlds interpretation]] of [[quantum mechanics]] carries this reference even in its name. Talk of different worlds is also common in everyday language, for example, with reference to the world of music, the world of business, the world of football, the world of experience or the Asian world. But at the same time, worlds are usually defined as all-inclusive totalities.<ref name="Sandkühler"/><ref name=" Mittelstraß"/><ref name="Fraassen"/><ref name="Duco"/> This seems to contradict the very idea of a plurality of worlds since if a world is total and all-inclusive then it cannot have anything outside itself. Understood this way, a world can neither have other worlds besides itself or be part of something bigger.<ref name="Sandkühler"/><ref name="Declos">{{cite journal |last1=Declos |first1=Alexandre |title=Goodman's Many Worlds |journal=Journal for the History of Analytical Philosophy |date=2019 |volume=7 |issue=6 |pages=1–25 |doi=10.15173/jhap.v7i6.3827 |url=https://philpapers.org/rec/DECGMW|doi-access=free }}</ref> One way to resolve this paradox while holding onto the notion of a plurality of worlds is to restrict the sense in which worlds are totalities. On this view, worlds are not totalities in an absolute sense.<ref name="Sandkühler"/> This might be even understood in the sense that, strictly speaking, there are no worlds at all.<ref name="Declos"/> Another approach understands worlds in a schematic sense: as context-dependent expressions that stand for the current domain of discourse. So in the expression "Around the World in Eighty Days", the term "world" refers to the earth while in the colonial<ref name="Wondrium Daily 2021">{{cite web | title=The Old World-New World Debate and the Columbian Exchange | website=Wondrium Daily | date=2021-01-31 | url=https://www.wondriumdaily.com/the-old-world-new-world-debate-and-the-columbian-exchange/ | access-date=2022-04-10}}</ref> expression "the [[New World]]" it refers to the landmass of North and South America.<ref name="Fraassen"/>

=== Cosmogony ===
{{main|Cosmogony}}
Cosmogony is the field that studies the origin or creation of the world. This includes both scientific cosmogony and creation myths found in various religions.<ref name="Long">{{cite book |last1=Long |first1=Charles |title=Encyclopedia of Religion |url=https://www.encyclopedia.com/science-and-technology/astronomy-and-space-exploration/astronomy-general/cosmogony |chapter=Cosmogony}}</ref><ref>{{cite web |title=Cosmogony |url=https://www.britannica.com/science/cosmogony |website=Encyclopedia Britannica |access-date=12 April 2021 |language=en}}</ref> The dominant theory in scientific cosmogony is the [[Big Bang theory]], according to which both space, time and matter have their origin in one initial singularity occurring about 13.8 billion years ago. This singularity was followed by an expansion that allowed the universe to sufficiently cool down for the formation of subatomic particles and later atoms. These initial elements formed giant clouds, which would then coalesce into stars and galaxies.<ref name="Zeilik25"/> Non-scientific creation myths are found in many cultures and are often enacted in rituals expressing their symbolic meaning.<ref name="Long"/> They can be categorized concerning their contents. Types often found include creation from nothing, from chaos or from a cosmic egg.<ref name="Long"/>

=== Eschatology ===
{{main|Eschatology}}
Eschatology refers to the science or doctrine of the last things or of the end of the world. It is traditionally associated with religion, specifically with the [[Abrahamic religions]].<ref>{{cite web |title=Eschatology |url=https://www.britannica.com/topic/eschatology |website=Encyclopedia Britannica |access-date=13 April 2021 |language=en}}</ref><ref>{{cite book |last1=Owen |first1=H. |title=Encyclopedia of Philosophy |url=https://www.encyclopedia.com/philosophy-and-religion/bible/bible-general/eschatology |chapter=Eschatology}}</ref>
In this form, it may include teachings both of the end of each individual human life and of the end of the world as a whole. But it has been applied to other fields as well, for example, in the form of physical eschatology, which includes scientifically based speculations about the far future of the universe.<ref name="Halvorson">{{cite web |last1=Halvorson |first1=Hans |last2=Kragh |first2=Helge |title=Cosmology and Theology: 7. Physical eschatology |url=https://plato.stanford.edu/entries/cosmology-theology/#7 |website=The Stanford Encyclopedia of Philosophy |publisher=Metaphysics Research Lab, Stanford University |access-date=13 April 2021 |date=2019}}</ref> According to some models, there will be a [[Big Crunch]] in which the whole universe collapses back into a singularity, possibly resulting in a second [[Big Bang]] afterward. But current astronomical evidence seems to suggest that our universe will continue to expand indefinitely.<ref name="Halvorson"/>

=== World history ===
{{main|World history (field)}}
World history studies the world from a historical perspective. Unlike other approaches to history, it employs a global viewpoint. It deals less with individual nations and civilizations, which it usually approaches at a high level of abstraction.<ref name="Bentley">{{cite web |last1=Bentley |first1=Jerry H. |editor1-first=Jerry H |editor1-last=Bentley |title=The Task of World History |url=https://www.oxfordhandbooks.com/view/10.1093/oxfordhb/9780199235810.001.0001/oxfordhb-9780199235810-e-1 |website=The Oxford Handbook of World History |access-date=14 April 2021 |language=en |doi=10.1093/oxfordhb/9780199235810.001.0001 |date=31 March 2011|isbn=978-0-19-923581-0 }}</ref> Instead, it concentrates on wider regions and zones of interaction, often interested in how people, goods and ideas move from one region to another.<ref>{{cite web |title=What Is World History? |url=https://www.thewha.org/about/what-is-world-history/ |publisher=World History Association |access-date=14 April 2021}}</ref> It includes comparisons of different societies and civilizations as well as considering wide-ranging developments with a long-term global impact like the process of industrialization.<ref name="Bentley"/> Contemporary world history is dominated by three main research paradigms determining the periodization into different epochs.<ref name="Cajani">{{cite book |last1=Cajani |first1=Luigi |editor1-first=Jerry H |editor1-last=Bentley |title=The Oxford Handbook of World History |date=2011 |url=https://www.oxfordhandbooks.com/view/10.1093/oxfordhb/9780199235810.001.0001/oxfordhb-9780199235810-e-4 |language=en |chapter=Periodization|publisher=Oxford University Press |doi=10.1093/oxfordhb/9780199235810.013.0004 |isbn=978-0-19-923581-0 }}</ref> One is based on productive relations between humans and nature. The two most important changes in history in this respect were the introduction of agriculture and husbandry concerning the production of food, which started around 10,000 to 8,000&nbsp;BCE and is sometimes termed the [[Neolithic Revolution]], and the [[Industrial Revolution]], which started around 1760 CE and involved the transition from manual to industrial manufacturing.<ref>{{cite book |author=Graeme Barker |title=The Agricultural Revolution in Prehistory: Why did Foragers become Farmers? |url=https://books.google.com/books?id=fkifXu2gx4YC |date=2009 |publisher=Oxford University Press |isbn=978-0-19-955995-4}}</ref><ref>{{cite web |title=Industrial Revolution |url=https://www.britannica.com/event/Industrial-Revolution |website=Encyclopedia Britannica |access-date=14 April 2021 |language=en}}</ref><ref name="Cajani"/> Another paradigm, focusing on culture and religion instead, is based on [[Karl Jaspers]]' theories about the [[Axial Age]], a time in which various new forms of religious and philosophical thoughts appeared in several separate parts of the world around the time between 800 and 200&nbsp;BCE.<ref name="Cajani"/> A third periodization is based on the relations between civilizations and societies. According to this paradigm, history can be divided into three periods in relation to the dominant region in the world: Middle Eastern dominance before 500&nbsp;BCE, Eurasian cultural balance until 1500&nbsp;CE and Western dominance since 1500&nbsp;CE.<ref name="Cajani"/> [[Big History]] employs an even wider framework than world history by putting human history into the context of the history of the universe as a whole. It starts with the [[Big Bang]] and traces the formation of galaxies, the [[Solar System]], the Earth, its geological eras, the evolution of life and humans until the present day.<ref name="Cajani"/>

=== World politics ===
World politics, also referred to as [[global politics]] or [[international relations]], is the discipline of political science studying issues of interest to the world that transcend nations and continents.<ref>{{cite book |editor1-last=Baylis |editor1-first=John |editor2-last=Smith |editor2-first=Steve |editor3-last=Owens |editor3-first=Patricia |title=The Globalization of World Politics: An Introduction to International Relations |date=2020 |publisher=Oxford University Press |isbn=978-0-19-882554-8 |edition=Eighth Edition, New to this |url=https://global.oup.com/academic/product/the-globalization-of-world-politics-9780198825548?cc=us&lang=en& |chapter=Glossary}}</ref><ref>{{cite book |last1=Blanton |first1=Shannon L. |last2=Kegley |first2=Charles W. |title=World Politics: Trend and Transformation, 17th Edition - 9780357141809 - Cengage |date=2021 |publisher=Cengage |url=https://www.cengage.com/c/world-politics-trend-and-transformation-17e-blanton/9780357141809/ |language=en |chapter=Glossary}}</ref> It aims to explain complex patterns found in the social world that are often related to the pursuit of power, order and justice, usually in the context of [[globalization]]. It focuses not just on the relations between nation-states but also considers other transnational actors, like multinational corporations, terrorist groups, or non-governmental organizations.<ref name="Baylis">{{cite book |editor1-last=Baylis |editor1-first=John |editor2-last=Smith |editor2-first=Steve |editor3-last=Owens |editor3-first=Patricia |title=The Globalization of World Politics: An Introduction to International Relations |date=2020 |publisher=Oxford University Press |isbn=978-0-19-882554-8 |edition=Eighth Edition, New to this |url=https://global.oup.com/academic/product/the-globalization-of-world-politics-9780198825548?cc=us&lang=en& |chapter=Introduction}}</ref> For example, it tries to explain events such as the [[September 11 attacks]], the [[2003 invasion of Iraq]] or the [[2008 financial crisis]].

Various theories have been proposed in order to deal with the complexity involved in formulating such explanations.<ref name="Baylis"/> These theories are sometimes divided into realism, liberalism and constructivism.<ref>{{cite book |last1=Blanton |first1=Shannon L. |last2=Kegley |first2=Charles W. |title=World Politics: Trend and Transformation, 17th Edition - 9780357141809 - Cengage |date=2021 |publisher=Cengage |url=https://www.cengage.com/c/world-politics-trend-and-transformation-17e-blanton/9780357141809/ |language=en |chapter=2. Interpreting World Politics through the Lens of theory}}</ref> Realists see nation-states as the main actors in world politics. They constitute an anarchical international system without any overarching power to control their behavior. They are seen as sovereign agents that, determined by human nature, act according to their national self-interest. Military force may play an important role in the ensuing struggle for power between states, but diplomacy and cooperation are also key mechanisms for nations to achieve their goals.<ref name="Baylis"/><ref>{{cite web |last1=Korab-Karpowicz |first1=W. Julian |title=Political Realism in International Relations |url=https://plato.stanford.edu/entries/realism-intl-relations/ |website=The Stanford Encyclopedia of Philosophy |publisher=Metaphysics Research Lab, Stanford University |access-date=14 April 2021 |date=2018}}</ref><ref>{{cite web |last1=Moseley |first1=Alexander |title=Political Realism |url=https://iep.utm.edu/polreal/ |website=Internet Encyclopedia of Philosophy |access-date=14 April 2021}}</ref> Liberalists acknowledge the importance of states but they also emphasize the role of transnational actors, like the [[United Nations]] or the [[World Trade Organization]]. They see humans as perfectible and stress the role of democracy in this process. The emergent order in world politics, on this perspective, is more complex than a mere balance of power since more different agents and interests are involved in its production.<ref name="Baylis"/><ref>{{cite web |last1=Cristol |first1=Jonathan |title=Liberalism |url=https://www.oxfordbibliographies.com/view/document/obo-9780199743292/obo-9780199743292-0060.xml |website=Oxford Bibliographies |access-date=14 April 2021 |language=en}}</ref> Constructivism ascribes more importance to the agency of individual humans than realism and liberalism. It understands the social world as a construction of the people living in it. This leads to an emphasis on the possibility of change. If the international system is an anarchy of nation-states, as the realists hold, then this is only so because we made it this way and may change since this is not prefigured by human nature, according to the constructivists.<ref name="Baylis"/><ref>{{cite web |last1=Cristol |first1=Jonathan |title=Constructivism |url=https://www.oxfordbibliographies.com/view/document/obo-9780199743292/obo-9780199743292-0061.xml |website=Oxford Bibliographies |access-date=14 April 2021 |language=en}}</ref>

== See also ==
{{portal|World}}
{{columns-list|colwidth=20em|
* [[Earth]]
* [[Empiricism]]
* [[Globe]]
* [[Holon (philosophy)|Holon]]
* [[Universe]]
* [[World map]]
}}

== References ==
{{reflist|30em}}

== External links ==
{{Wikiquote}}
* [https://www.cia.gov/the-world-factbook/countries/world/ World]. ''[[The World Factbook]]''. [[Central Intelligence Agency]].
* {{Commons category-inline|World}}

{{Continents of the world}}
{{Earth}}
{{World topic}}
{{Portal bar|Earth sciences|Environment|Geography|History}}
{{Authority control}}

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[[Category:World| ]]