Terminology

Plot Summary
The majority films will have a three act structure and this will then be similar to the feature length film, they will start with the beginning this will then lay out the premises of the story.  We then have the middle this will drive the story and will normally end with a dramatic climax.  Act 3 is were it has a strong music section were it will consist of a montage of images.

Voice Over
This is were a voice over is used as a narrator and will set up the movie and it will provide explanations when it is necessary.  Voice over is used as a useful tool to enhance the understanding of the plot to the audience

Music
Music Helps to set the tone within a film and also the mood of the film trailer.  Normally the music which will be used within the trailer will not be from the film, the music that will be used in the trailer might be:

• Music from the score of other movies
• Music which is well know and also popular and it will be chosen for its tone and the appropriateness of a lyric
• The term "Library" music is previously composed and this will be specifically in advertisement by a composer who will be independent 

Cast,Crew and studio information
The cast will run a list of the stars that will be in the film, if the director or the producer is well known in the film world and has made popular movies they will warrant a mention as well,  in the majority of film trailers at the end of the film trailer you will normally see something called Billing Block this is were a list of principal cast and crew will be shown.  This normally appears either at the start or end of a film.

Technical Elements
Sound Mix:  many different movie trailers are presented in Dolby Digital or any other multi channel sound mix. Scenes will include sound affects and also music that will have been enhanced by stereophonic sound and this is the focus point of modern day film trailers.
Video Resolution: Trailers today which are feature films are generally presented in the same format as the actual feature, being in general terms 35mm film or digital format.  High bandwidth internet connection will allow trailers to be distributed at any type of resolution up to 1080p.