A film projector is a device used to display movies or other visual content onto a screen or surface. It works by shining a beam of light through a film strip, which contains a series of individual frames that create the illusion of motion when projected at a rapid speed. The film projector's lens focuses the light onto the screen, allowing viewers to see the moving images and enjoy the cinematic experience. This technology has been widely used in theaters and cinemas throughout history, providing a captivating way to bring stories to life on the big screen.