Film trailers are an important marketing tool for movies as they create interest and promote the film. Trailers typically include key moments and highlights from the movie to entice viewers without revealing too much of the plot. They also showcase the main stars, director, and release date to attract audiences. The goal of a trailer is to make people want to see the full film by teasing elements of the story, characters, themes, and genre in an engaging way through video clips, music, and voiceovers.