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{{for|more extensive information for editors|Help:Category}}<br />
{{information page|H:CATS}}<br />
{{Reader help}}<br />
'''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, as well as any sub-categories. Categories allow readers to navigate through Wikipedia and find related articles.<br />
<br />
==Category tree==<br />
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:<br />
<br />
{| align = "center"<br />
| <br />
[[:Category:Main topic classifications]]<br />
↓<br />
[[:Category:History]]<br />
↓<br />
[[:Category:History by location]]<br />
↓<br />
[[:Category:History by country]]<br />
↓<br />
[[:Category:History of Australia]]<br />
↓<br />
[[:Category:History of Australia by location]]<br />
↓<br />
[[:Category:History of Australia by state or territory]]<br />
↓<br />
New South Wales, Queensland, etc.<br />
<br />
|}<br />
<br />
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:<br />
<br />
<br><br />
[[File:Category-diagram.png|border|400px|center]]<br />
<br />
<br />
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. <br />
<br />
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.<br />
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[[Category:Wikipedia categorization|*]]</div>Adminpeter