A movie trailer is a short promotional video that showcases highlights from an upcoming film. Typically lasting between one to three minutes, trailers aim to generate excitement and interest among potential viewers. They often include key scenes, music, and voiceovers to convey the film's tone and storyline without revealing too much. Trailers are usually released several months before a movie's premiere and can be found in theaters, on television, and online platforms like YouTube. They play a crucial role in marketing, helping audiences decide whether to watch the film when it is released.