The term "trailer" dates back to the distribution of movies on reels of film.
The reels were always distributed un-rewound .
Therefore, the end of the movie was the most accessible part, to which previews were spliced, "trailing" the film.Movie trailers have now become popular on DVDs and Blu-ray discs, as well as on the Internet and mobile devices.
Of some 10 billion videos watched online annually, film trailers rank third, after news and user-created video.
The trailer format has also been adopted as a promotional tool for television shows, video games, books, and theatrical events/concerts.Read more