A film trailer is a short advertisement for an upcoming movie. It aims to build hype and interest in the film's release. Effective trailers are typically 1-2 minutes long and utilize dramatic music, camera angles, and voiceovers to tease the plot and characters without revealing too much. Text is often included at the end to display the film title, release date, and starring actors. The goal is to attract audiences to the full film through a compelling preview of the action, emotions, and personalities they will experience.