At tvwish content types or program categories are the way to classify the content type of a tv program e.g. Hindi Movie or English Movie.
It provides an easier way to look or search into content of your interest across channels e.g. Someone may be interested in sports programs while others may be interested in Hollywood or the English movies.
You will also see channels broadcasting similar content types in same group.
Here is a list of all the content types on tvwish