you study the media.
EG Radio, film, sitcom, quiz shows, magazines, newspapers.
I'm in year eleven now, and so far in media, I have studied:
Magazines- How they appeal to their audiences
symbolism used in imagery
Film- Genre
Action and adventure films
Film posters
Sitcom- TV sitcom
History of Sitcom
Creating your own sitcom.
It's a fun subject, but if you're interested in journalism or reporting, you'd be better off with history.
If you'd like to work as an actor, you'd be better off with drama.
And if you're interested in photography, you don't do that much of it.
Hope this helps.