The dark knight

The Dark Knight is one of my favorite movies.
The video is basically a trailer of the movie itself,it shows how the action is going on in the movie and who the actors.The video shows how the Joker is trying to kill Batman.
I think the target audience is 15+,because is quite violent and it's a lot of blood and killing.It's not healthy for children under 15 to see so much violence.
The video appears on internet. Internet is one of the best ways to make publicity for the next movies that will come out.Millions of people everyday go online and they can see any trailer they want for a movie that will come out soon.
The purpose of the video is to get the public into the movie.They try to create us an idea about what it's going to be in this movie and to persuade us to go to the cinema and see the film.