Product Types --> Trailers
Trailers
Trailers have been around for a very long time. It is the one to three minute preview of a coming movie. Initially they were shown after the major film was shown, hence the name 'trailer'.
As theaters grew, it was realized that they could sell more popcorn and goodies if the trailers were shown in front of the film instead of after. More people would also see the coming attractions. Trailers have now branched to several formats including; 35mm, beta, VHS, and now on DVD. These version are now becoming more common in the collector's market.
Here is a sample of a trailer: