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Previously, the Topic namespace was available for the [[Wikipedia:Flow|Flow project]] but it has since been turned off on this wiki.
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== Subject namespaces ==
{{see|Wikipedia:Administration#Data structure and development}}
[[File:Policies and guidelines indicator.png|thumb|350px|This page is in the [[Wikipedia:Project namespace|Wikipedia namespace]].]]
Namespaces allow for the organization and separation of [[Wikipedia:Administration#Content namespaces|content pages]] from [[Wikipedia:Administration#Administrative namespaces|administration pages]]. Namespaces separate data into core sets, those intended for public viewing, and those intended for the editing community. Wikipedia's subject namespaces and their functions are listed below. A brief description is provided, but see the link for more information.
{{anchor|subjectpage}}A namespace is sometimes called a ''space'', for short, as in "Project space". A ''subject page'' and its ''talk page'' form a pair.
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===In use===
* '''[[Wikipedia:Main namespace|Main namespace]]''' (no prefix): contains all encyclopedia articles, lists, [[Wikipedia:Disambiguation|disambiguation pages]], and encyclopedia [[Wikipedia:Redirect|redirects]]. Sometimes referred to as "mainspace" or "Article".
* '''[[Wikipedia:User namespace|User namespace]]''' (prefix '''User:'''): contains user pages and other pages created by individual users for their own personal use. Pages under this namespace can still be viewed and modified by others, so do not keep any of your sensitive data here.
* '''[[Wikipedia:Wikipedia namespace|Wikipedia namespace]]''' or '''[[Wikipedia:Project namespace|Project namespace]]''' (prefix '''Wikipedia:'''): contains many types of pages connected with the Wikipedia project itself: information, policies, guidelines, essays, processes, discussion, etc. [[Wikipedia:Namespace#Aliases|Namespace aliases]]: '''WP:''' or '''Project:'''
*{{anchor|File|File namespace}}'''[[Wikipedia:File namespace|File namespace]]''' (prefix '''File:'''): contains [[Help:File description page|description pages for media files]] (images, videos, and audio files). A link starting with <code><nowiki>[[File:</nowiki></code> will display the media at that position on the page instead of showing a wikilink that leads to the specified file description page, so if you want the latter effect, use a link beginning with <code><nowiki>[[:File:</nowiki></code> (the [[Help:Colon trick|colon trick]]). Namespace alias: '''Image:'''
* '''[[Help:MediaWiki namespace|MediaWiki namespace]]''' (prefix '''MediaWiki:'''): a namespace containing interface texts, such as the links and messages that appear on automatically generated pages. Pages in this namespace are permanently [[Wikipedia:Protection policy|protected]] against editing by regular users. For a list of these messages, see [[Special:AllMessages]]. (The prefix ''cannot'' be shortened to "MW" because '''mw''' is an interwiki prefix. See ''[[#Interwiki links|Interwiki links]]'' below.)
* '''[[Wikipedia:Template namespace|Template namespace]]''' (prefix '''Template:'''): contains templates – pages that are intended primarily to be [[Wikipedia:Transclusion|transcluded]] or [[Wikipedia:Substitution|substituted]] onto other pages to insert standard text or boxes such as infoboxes and navigation boxes.
* '''[[WP:Help namespace|Help namespace]]''' (prefix '''Help:'''): contains pages which provide help in using Wikipedia and its software, both for users of the encyclopedia and for editors.
* '''[[Wikipedia:Category namespace|Category namespace]]''' (prefix '''Category:'''): contains category pages, which are curated lists of related pages and subcategories, along with optional additional text. A link beginning with <code><nowiki>[[Category:</nowiki></code> has the effect of adding the page the link appears on to the specified category; it will not result in a wikilink to the category page itself. If you want the latter, use the [[Help:Colon trick|colon trick]]: <code><nowiki>[[:Category:</nowiki></code>.
* '''[[Wikipedia:Portal namespace|Portal namespace]]''' (prefix '''Portal:'''): for reader-oriented portals that help readers find articles related to a specific topic, and may contain links to encourage contributions to relevant [[Wikipedia:WikiProject|WikiProjects]]. See, for example, [[Portal:Cricket]] and [[Portal:Spaceflight]].
* '''[[Wikipedia:Draft namespace|Draft namespace]]''' (prefix '''Draft:'''): hosts drafts of new (potential) Wikipedia articles.
* '''[[mw:Extension:TimedMediaHandler|TimedText namespace]]''' (prefix '''TimedText:'''): synchronized subtitles for media files.
* '''[[Wikipedia:Module namespace|Module namespace]]''' (prefix '''Module:'''): contains [[mw:Extension:Scribunto|Scribunto]] modules – Lua scripts implementing special-purpose [[mw:Manual:Parser functions|parser functions]] for use in templates, beyond the [[Help:Magic words#Parser functions|basic set]] included with MediaWiki and its [[mw:Extensions FAQ|extensions]].
===Deprecated===
* '''Gadget namespace''' (prefix '''Gadget:'''): installed but not currently in use.<ref>[[Wikipedia:Village pump (technical)/Archive 139#New "Gadget:" and "Gadget definition:" namespaces?]]</ref> [[Wikipedia:Gadget|Gadgets]], which are small [[Snippet (programming)|snippets]] enabled in [[Special:Preferences#mw-prefsection-gadgets|user preferences]], currently use the [[Help:MediaWiki namespace|MediaWiki namespace]] with the ''MediaWiki:Gadget-'' page name prefix. It is a [[mw:Manual:Using custom namespaces|custom namespace]] installed by the [[mw:Extension:Gadgets|Gadget extension]].
* '''Gadget definition namespace''' (prefix '''Gadget definition:'''): installed but not currently in use; see above for more information. Gadget definitions currently use the [[MediaWiki:Gadgets-definition]] page.
===Not installed===
On [[MediaWiki]] installations other than the English Wikipedia, additional namespaces may be installed by [[mw:Manual:Extensions|MediaWiki extension]]s; the list of default IDs for these namespaces is at [[mw:Extension default namespaces|Extension default namespaces]].
*'''[[Wikipedia:Flow|Flow namespace]]''' (prefix '''Topic:''') was a proposed talk page replacement, formerly installed on English Wikipedia by [[mw:Extension:StructuredDiscussions|Extension:StructuredDiscussions]]. It is no longer installed after being rejected by the community.
* '''[[Wikipedia:Course pages|Education Program namespace]]''' (prefix '''Education Program:'''): uninstalled in 2018, and replaced with the [[wmfdashboard:|Programs & Events Dashboard]].<ref>[https://outreach.m.wikimedia.org/wiki/Education/News/January_2018/Education_Extension_scheduled_shutdown Education_Extension_scheduled_shutdown, Wikimedia outreach]</ref><ref>[[Wikipedia:Education noticeboard/Archive 18#NOTICE:_EducationProgram extension is being deprecated]]</ref> However, the namespace was re-added later that year to allow access to old talk pages in the Education program talk: namespace. The namespace was then uninstalled again in 2021 after the remaining talk pages were moved to subpages of [[Wikipedia talk:Education program archive]].
* '''[[Wikipedia:Books|Book namespace]]''' (prefix '''Book:'''): contained entries for Wikipedia books, collections of articles about one theme, which were used to generate downloadable files or printable documents or order books from PediaPress. In 2017, the online book rendering service was withdrawn, leading to the removal of most links leading to the namespace in 2019. The namespace and its transclusions were still retained in the hope that the WMF would come up with a solution,<ref>{{Section link|Wikipedia:Village pump (technical)/Archive 176|Suppress rendering of Template:Wikipedia books}}</ref> but in 2021 the namespace was uninstalled after all remaining books were moved to subpages of [[Wikipedia:Books/archive]].
===Aliases and pseudo-namespaces===
An ''alias'' of a namespace is its namespace. For example, '''WP:''' is '''Wikipedia:''', and so
<code><nowiki>[[</nowiki>Wikipedia:[[WP:Page name|''Page name'']]]]</code> can be abbreviated <code><nowiki>[[WP:</nowiki>[[WP:Page name|''Page name'']]]]</code>.
See ''[[#Aliases|Aliases]]'' below, for a list of aliases, such as '''WT:''' for '''Wikipedia talk:'''.
A ''pseudo-namespace'' is an agreement to create redirect pages named that way, each of which
is a shortcut from mainspace to ''a single page in its namespace''.
So an alias refers to ''any page in its namespace'', but a pseudo-namespace has far fewer pages than its real namespace.
There are a few pseudo-namespace names like '''H:''' for '''Help:''', and '''CAT:''' for '''Category:''', and these can be discovered below in the section ''[[#Pseudo-namespaces|Pseudo-namespaces]]''.
== <span id="Talk"></span><span id="Wikipedia talk"></span><span id="WT"></span> Talk namespaces==
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