Help:Categories
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Categories are used in Wikipedia to link articles under a common topic and are generally found at the bottom of the article page. Clicking the category name displays a list of articles in that category, as well any sub-categories. Categories help readers to navigate, sort, find articles, find related articles, see how information is organised, etc.
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 is shown below:
The actual relationship can be a little more complex as a category may appear as a subcategory of several other categories.
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