A camera is a device used to capture and record visual images. It consists of a lens that focuses light onto a photosensitive surface, such as film or an image sensor, which converts the light into an electrical signal. Cameras are commonly used in photography and videography to document and preserve moments, scenes, and events. They come in various types, including digital cameras, film cameras, DSLRs, mirrorless cameras, and smartphone cameras, offering different features and capabilities for capturing still images and videos.