A camera is a device used to capture images, either as still photographs or as moving pictures (videos). It works by allowing light to enter through a lens, which focuses the light onto a sensor or film. This process creates a visual representation of the scene in front of the camera. There are various types of cameras, including digital cameras, film cameras, and smartphone cameras. Each type has its own features and uses, but they all serve the same basic purpose: to record moments and preserve memories. Popular brands include Canon, Nikon, and Sony.