A film trailer is a commercial that previews a movie to entice audiences to watch it. The author reviewed audience feedback on trailers and found that effective trailers either use the best bits from the film to excite viewers or reveal parts of the narrative without giving away the whole storyline, keeping the trailer enigmatic. Based on this research, the author concluded that a good trailer persuades potential viewers to see the movie by showing exciting clips or providing insight into the film's story in a mysterious way.