Thread:Andrey Andrey/@comment-26808654-20150627180943/@comment-25390652-20150627191010

Sub catetegory is when someone created a new category and categorized it.

For example, there was an existing category — Characters.

Then someone created another category — Crystal Gems and then gave the category "Character" to the category "Crystal Gems"

As result, Crystal Gems is listed as a sub category on the Character category page.