Resident Evil: Welcome to Raccoon City Trailer #1 (2021) | Movieclips Trailers
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Welcome to Earth | Official Trailer | Disney+
A trailer is a commercial advertisement for a feature film that will be exhibited in the future at a cinema, the result of creative and technical work. 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 begins.