Wikipedia data structure
Subject namespacesTalk namespaces
0 (Main/Article)Talk 1
2 UserUser talk 3
4 WikipediaWikipedia talk 5
6 FileFile talk 7
8 MediaWikiMediaWiki talk 9
10 TemplateTemplate talk 11
12 HelpHelp talk 13
14 CategoryCategory talk 15
100 PortalPortal talk 101
118 DraftDraft talk 119
710 TimedTextTimedText talk 711
828 ModuleModule talk 829
2300 GadgetGadget talk 2301
2302 Gadget definitionGadget definition talk 2303
Not installed
108 Book 109
446 Education Program 447
2600 Topic 2601
Virtual namespaces
-1 Special
-2 Media

Categories are intended to group together pages on similar subjects. They are implemented by a MediaWiki feature that adds any page with a text like [[Category:XYZ]] in its wiki markup to the automated listing that is the category with name XYZ. Categories help readers to find, and navigate around, a subject area, to see pages sorted by title, and to thus find article relationships.

Categories are normally found at the bottom of an article page. Clicking a category name brings up a category page listing the articles (or other pages) that have been added to that particular category. There may also be a section listing the subcategories of that category. The subcategorization feature makes it possible to organize categories into tree-like structures to aid navigation.

The term category does refer to both the title of a category page—the category pagename—and the category itself. Keeping this in mind while reading about categorization, plus learning a category page layout is a worthwhile investment in research techniques. (See also the search box parameter "incategory".) The layout of a category page is mostly text, but see about displaying category trees below.

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This article uses material from the Wikipedia article Help:Category, and is written by contributors. Text is available under a CC BY-SA 4.0 International License; additional terms may apply. Images, videos and audio are available under their respective licenses.