|This is a container category. Due to its scope, it should contain only subcategories.|
This is the top level of Wikipedia's category system (which is why it has no parent category). Its subcategories contain various types of encyclopaedic content (i.e. articles), content that assists with the navigation of the encyclopaedia (e.g. portals), as well as pages related to maintaining and collaborating on the encyclopaedia (e.g. Wikipedia administration and WikiProjects).