Categories are used in Wikipedia to link articles under a common topic and are generally found at the bottom of the page. Clicking the category name displays a list of pages (articles) and sub-categories within it.

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 is shown below:

Category:History Category:History by location Category:History by country
Category:History of Australia Category:History of New South Wales
Category:History of the United States Category:History of California
Category:History of Zambia

The actual relationship can be a little more complex as a category may appear as a subcategory of several other categories.

The top level categories of interest to readers are Category:Articles and Category:Contents, as all articles can be found from these.

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