What is the function of a trailer in film marketing?

The function of a trailer in film marketing is primarily to generate excitement and interest among potential audiences. A trailer is designed to highlight key moments, visuals, and themes of the film without revealing too much of the plot. Its primary goal is to entice viewers, making them curious and eager to see the movie upon its release.

In contrast, summarizing the entire plot would undermine the suspense and intrigue that a trailer is meant to create. Providing actor interviews or behind-the-scenes footage serves different purposes, such as promoting the film or engaging fans, but they do not fulfill the primary role of the trailer itself, which focuses on attracting the audience's attention and generating buzz around the film.