This is a maintenance category, used for maintenance of the Wikipedia project. It is not part of the encyclopedia and contains non-article pages, or groups articles by status rather than subject. Do not include this category in content categories.

This is a tracking category. It builds and maintains a list of pages primarily for the sake of the list itself. They are not part of the encyclopedia's categorization scheme.

The pages in this category are disambiguation pages. It enables us to use {{PAGESINCATEGORY:All disambiguation pages}} to get the exact number of disambiguation pages in Wikipedia. To add a page to this category, tag it with a disambiguation template (templates built with the {{dmbox}} meta-template, which does the actual categorising).

• This category is hidden on its member pages—unless the corresponding user preference (appearance → show hidden categories) is set.
• These categories can be used to track, build and organize lists of pages needing "attention en masse" (for example, pages using deprecated syntax), or that may need to be edited at someone's earliest convenience.
• These categories also serve to aggregate members of several lists or sub-categories into a larger, more efficient list (discriminated by classifications).