Help:Categories

For more information, see Wikipedia:FAQ/Categories.
For information for editors on how to categorize a page, see Help:Category and Wikipedia:Categorization.

Categories are used in Wikipedia to link articles under a common topic and are found at the bottom of the article page. Clicking the category name displays a list of articles in that category, below a list of sub-categories (categories in that category) (if any). Categories allow readers to navigate through Wikipedia and find related articles.

Categories are not displayed in the mobile version (phab:T24660). Mobile users can click "Desktop" at the bottom of a page to see the desktop version with categories. Registered users can enable Advanced mode which includes a "Categories" button.

The bottom of the Wikipedia article Chicken eyeglasses. At the very bottom of the page, below the References, navigation templates and external links are a series of links. These links are the categories used on the page, which include: Category:Animal welfare, Category:Animal equipment, Category:Eyewear, and Category:Poultry farming. By clicking on the category link at the bottom of the page, readers can navigate the Category tree (see below).

Category tree

All of the categories form a hierarchy, although sub-categories may be a member of more than one category. An example of a small part of this hierarchical structure looks somewhat like this: 

    Category:Main topic classifications
                      ↓
              Category:History
                      ↓
       Category:History by location
                      ↓
       Category:History by country
                      ↓
      Category:History of Australia
                      ↓
     Category:History of Australia by location
                      ↓
Category:History of Australia by state or territory
                      ↓
      New South Wales, Queensland, etc.

The actual relationship is more complex since a category may appear as a subcategory of several other categories. The actual relationship of part of the category structure looks like this:

The uppermost category in the hierarchy is Category:Contents. From here all other categories branch out, including those that are used for the maintenance of Wikipedia.

If an entry in a category is shown in italics it is a redirect to an article of a different name or a section of an article that contains information about that particular subject.

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