A slide projector is a device used to display photographic slides on a screen or wall. It works by shining a bright light through a transparent slide, which is typically made of glass or plastic, and projecting the image onto a larger surface. Slide projectors were popular for presentations and home entertainment before the rise of digital technology. These projectors often come with a carousel or tray that holds multiple slides, allowing users to change images easily during a presentation. While they have largely been replaced by digital projectors and computers, slide projectors remain a nostalgic tool for showcasing photography and artwork.