A film projector is a device that displays moving images from a film reel onto a screen. It works by shining a light through the film, which is made up of a series of still images. As the film moves, these images are projected in rapid succession, creating the illusion of motion. Film projectors are commonly used in cinemas and for home movie screenings. They can vary in size and complexity, with some designed for professional use and others for personal enjoyment. The technology has evolved over the years, leading to the development of digital projectors, which use digital files instead of physical film.