This template is used on approximately ५९० pages, so changes to it will be widely noticed. Please test any changes in the template's /sandbox or /testcases subpages, or in your own user subpage. Please consider discussing changes on the talk page before implementing them.
This template is meant to be used for content category pages. It produces a box indicating that all articles in the current category should be listed in the category's page, regardless of whether or not they are listed in one or more subcategories. See Wikipedia:Categorization#Subcategorization for more details.