This template is used on many pages and changes may be widely noticed. Test changes in the template's /sandbox or /testcases subpages, or in your own user subpage. Consider discussing changes on the talk page before implementing them.
This template strips categories from wikitext. For example, if passed the code "foo[[Category:Some category]]", it will return only "foo". It can be used to strip categories from templates as well; if passed the code "{{my template}}", it will return the template output minus the categories.
The template properly handles categories escaped with the colon trick, categories whose names include invalid characters such as ">", and categories that are surrounded with nowiki tags. However, it does not support complex wikitext such as nested links or magic words like __TOC__. Even so, it should still remove the vast majority of categories from any given wikitext.