Functions of a trailer

A trailer has many functions as they are one of the most important parts of trying to market a film.They promote films in similar ways to how adverts promote other products.The aim of a trailer is to try and create immediate interest with the audience before the film is released in cinemas.Similar to posters trailers are often made in several different versions and processes.There can be 'teaser trailers' for the audience as this is created to excite the audience with a few details about the film.When the film is closer to being released they give out more information which includes the all important release date and the producers of the film e.g Warner Brons.

The Functions/Conventions:
- Including key movements from the film which arent placed in the same order as the film so it doesnt give away any crucial details of the plot as some trailers can be criticised for giving to much detail away to the audience.
-At the end of the trailer the title of the film is shown and it is then often followed by the release date
-The main stars that feature in the film as characters are put on early in the trailer, this is crucial as it lets the audience know who they can expect to see in the film.The audience may often decide they want to see a film because of the stars that feature in it.
-Sometimes the director or producer are included they can include phrases such as "From the director/makers of".