A category is a WikiName that exploits [wiki:WikiWiki WikiWiki]'s reverse linking. If you click on the title of a category page, you'll get a list of pages belonging to that category. To get a list of all categories, click above on the CategoryCategory title.
Here is a list of all categories known to this wiki: PageList(^Category.*)
Here is a list of all pages containing the CategoryCategory wiki tag: FullSearch()
To be consistent with the C2 category scheme, all categories start with the word "Category". For more information, see AboutCategoriesAndTopics.