What is the difference between a trailer and a teaser trailer

A teaser trailer, or just teaser, is a short trailer used to advertise an upcoming film, television program, video game or similar, usually released long in advance of the product, so as to "tease" the audience.

Teasers are also commonly used in advertising. The so-called teaser ad or teaser campaign typically consists of a series of small, cryptic, challenging advertisements which anticipate a large(r), full-blown campaign for a product launch or otherwise important event.

Movie teasers, unlike typical theatrical trailers, are usually very short in length (between 30–60 seconds) and usually contain little, if any, actual footage from the film. Sometimes, it is merely a truncated version of a theatrical trailer. Tester trailers are usually only made for big-budget and popularly themed movies. Their purpose is less to tell the audience about a movie's content than simply to let them know that the movie is coming up in the near future, and to add to the hype of the upcoming release. Teaser trailers are often made while the film is still in production or being edited and as a result they may feature scenes or alternate versions of scenes that are not in the finished film. Other ones (notably Pixar films) have scenes made for use in the trailer only. Teaser trailers today are increasingly focused on internet downloading and the convention circuit.

An early example of the teaser trailer was the one for the Superman film by Richard Donner. The film was already nearly a year late; it was designed to re-invigorate interest in the release. The teaser for the Batman film starring Michael Keaton in 1989 was an emergency marketing move that successfully convinced angered comic book fans that the film would respect the source material.[citation needed]

A trailer or preview is an advertisement for a feature film that will be exhibited in the future at a cinema. The term "trailer" comes from their having originally been shown at the end of a feature film screening. That practice did not last long, because patrons tended to leave the theater after the films ended, but the name has stuck. Trailers are now shown before the film (or the A movie in a double feature) begins.

Movie trailers have now become popular on the Internet. Of some 10-billion videos watched online annually, movie trailers rank #3, after news and user-created video.