A motion picture projector is a device that displays moving images from film or digital sources onto a screen. It works by rapidly advancing a strip of film or a digital file, illuminating the images with a bright light source, and projecting them through a lens. This creates the illusion of motion, allowing viewers to enjoy movies in theaters or at home. These projectors can vary in size and technology, from large cinema projectors used in movie theaters to smaller, portable models for personal use. They often include features like sound playback and the ability to connect to computers or streaming devices for enhanced viewing experiences.