A CAM, or camera, is a device used to capture images or videos. It works by focusing light through a lens onto a sensor or film, which records the visual information. Cameras come in various types, including digital cameras, film cameras, and smartphone cameras, each with unique features and capabilities. Modern cameras often include additional functionalities, such as autofocus, image stabilization, and various shooting modes. They can also connect to computers and smartphones for easy sharing and editing of photos. Popular brands include Canon, Nikon, and Sony, which offer a range of models for both amateur and professional photographers.