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Categories only show the page name of each page being categorized. So while the category description of the category may provide broader information, individual category members cannot be annotated with descriptions or comments, so they give no context or elaboration for any specific entry.
Every category page should have at least one parent—a higher-level category. (The exception, of course, is the category page at the very top of the hierarchy.) Or, to put it differently, every category page but the very highest (shown in Figure 17-5) should be within a subcategory of at least one higher-level category. Figure 17-5.
To display all subcategories at once, add a category tree to the text of the category page, as described at Help:Category § Displaying category trees and page counts. Category pages can have interlanguage links in the "Languages" list in the left sidebar (in the default skin), linking to corresponding categories in other language Wikipedias.
mode=pages displays only the pages in the category; mode=all displays subcategories, pages and images; mode=parents displays only the parent categories; mode is categories by default. depth=1 displays one level of the tree; depth=2 displays two levels of the tree, and so forth; depth is 0 by default. hideroot=on hides the root category ...
One series of templates and categories is used only for redirects. The templates place redirects into the categories. The templates also explain why the redirect exists, for example {{R from merge}} means it was created by a merge or {{R from alternative name}} means that the redirect is an alternative name for the main title.
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".)
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A prominent link to the most important article in the category is usually a good idea, but please avoid copying large quantities of text or images from an article to a category page. In many cases, a category has a "main article", which describes the subject of that category. The category and the article often have the same name.