68u Content Category

Obviously, I have a 68u running 380_3264. Can someone explain in further detail about content category? When you look at parental control the content categories (Adult, IM/Communication, P2P/File Transfer, Streaming/Entertainment) are very broad and there isn't a lot of information about it. Some of these categories are self explanatory like Adult while others are not. Plus, you have sub categories as well. Like what is Mobile?

For example, downloading an App from the App store would...

68u Content Category