Difference between an opening sequence and a trailer

There are many differences between a trailer and opening scene of a film. A trailer is a clip of different shots and scenes from a movie, it contains the most attractive and enjoyable scenes from the actual film that is going to be released. A trailer comes out before the film and it is very much like a montage and is made to try and persuade the audience to go and pay to watch the whole movie. It is a clip, which is condones the movie it will contain many types of media technique aspects such as sound, different types of camera shots and so on. The big difference is a trailer is more compact and contains quick shots and summarizes the film but leaves a cliffhanger. An opening scene contains the credits of producers and the makers of the film; this is so the audience slowly gets into the film and the atmosphere of it. A trailer summarises the film however it does not show the possotive equilibrium at the end of the film, it stops when the bad at the thrilling and bad part.