Why do they call "Movie trailers", trailers? They come at the beginning..?

Question

of the movie. What is the history behind the name?

Answer 1

Found this..

Trailer (film)
From Wikipedia, the free encyclopedia

The term "trailer" comes from their having originally been shown at the end of a film programme. 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-film in a double-bill programme) begins.