Trailers consist of a series of selected shots from the film being advertised. Since the purpose of the trailer is to attract an audience to the film, these excerpts are usually drawn from the most exciting, funny, or otherwise noteworthy parts of the film but in abbreviated form and usually without producing spoilers.

Why are they called trailers movies?

The short films came to be known as trailers because the projectionists originally tended to add them to the end of the reels of the B-movie in a show. Thus they trailed after the supporting movie but came before the main feature.

Why do movie trailers reveal so much?

The Reason Movie Trailers Give So Much Away. Spoilers in movie trailers can frustrate film fans. ... Studios usually farm out trailers to companies specializing in editing and promotion. Dozens of different versions of a trailer will be edited and then shown to test audiences in order to see what they find most appealing.