For convenience, all redirect categories should be included in this category. This includes all redirects that can also be found in the subcategories.

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 container category. Due to its scope, it should only contain subcategories.

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.

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).

Description:

This category contains all the categories about redirects.This category should not contain any redirects itself; there are so many of them that a category of them all would be unmanageable. However, certain kinds of redirect are categorized by type—for example, redirects from misspellings. For a list of templates that can be applied to redirect pages, see Wikipedia:Template messages/Redirect pages.