When used with the "Redirect category shell" (Rcat shell) template:

Template {{Redirect category shell}} may be used to add one or more rcat templates, along with their parameters and categories, to a redirect. For more information, see the documentation page below.

When used by itself:

  • Interwiki target: This is a redirect from a systematic cross-project target to the relevant Wikipedia page. It is used to aid connections from other Wikimedia projects. Some processes like requesting a new language project automatically create interwiki links. Sometimes they target the wrong page and this redirect prevents breakage.
  • A page from Meta-Wiki links to this page. This redirect should remain in place so as not to break the connection from Meta.