Thrillers - Opening Sequences Vs Trailers

Opening sequences and media trailers are different.
A trailer gives an overview of the story or the plot of the film and shows the 'good bits' of the film with a voice over telling the audience the details of the film. A trailer also tells the audience who is acting in the film which creates hype about the film especially if there are a lot of famous actors. It doesn't give away the key information in the film otherwise there would be no reason to see the film. A trailer uses lots of shots edited at a fast pace to create a montage about the film to promote it. The point of a trailer is to persuade audiences to go and see the film where as an opening sequence is used to calm down the audience in preparation for the film.
An opening sequence also establishes the setting for the film and helps the audience to familiarise with the setting and introduces them to the main characters through the titles and by using slow paced shots of them which also helps to establish the mood of the film and creates an atmosphere. This atmosphere also helps the viewers to feel engaged within the story hooking them and grabbing their attention. The point of an opening sequence is o settle down the audience and to get them engaged in the story so that it can have more of an impact on them.