A movie trailer is a short promotional video that showcases highlights from an upcoming film. Typically lasting between one to three minutes, it features key scenes, music, and dialogue to generate excitement and interest among potential viewers. Trailers are often released several months before the film's premiere to build anticipation. Trailers are commonly shown in theaters before other movies and are also shared online through platforms like YouTube and social media. They serve as a marketing tool for film studios, helping to attract audiences and increase ticket sales when the movie is finally released.