The 3-sentence summary is: The document discusses the key elements that are commonly included in film trailers to entice audiences, such as using music and imagery to hint at the plot, setting, characters, and genre of the film being advertised. Trailers also typically include a tagline to leave the audience with an intriguing message, and will announce the release date and name of the film to inform viewers when and where they can watch it. These elements are designed to generate questions and interest in the audience without revealing too much of the film's narrative.