What are categories?
Each page belongs to a category, which describes what the content in the page is: what to do with it, how to display it and in general its behaviour.
Each category can have meta info - defining some of its properties and associations to other categories.
You can specify if this topic needs an owner and what other roles of users is supports:
You can specify the types of visibility available to pages in this category:
Possible values are:
You can change the labels for like/follow, for all pages in this topic:
See the Wiki Domain Guide - you can associate categories like so:
The types of roles that are understood are:
You can define your own roles as long as they don't conflict with the reserved roles above.