|Using community / Using content|
Content categories associate content with keywords for easier searching later.
Content categories are words or phrases predefined by administrators within a particular place, such as a space or social group. If there are categories available in the place, it usually means that the place administrator has given thought to how that place content should be grouped. An administrator who creates a category can optionally associate certain tags with it.
To apply a category to a content item:
Under Categories, you can see the list of categories that have been defined for the place of the content item.