The document discusses various input and output devices used in computer graphics. It lists keyboards, mice, trackballs, joysticks, data gloves, digitizers, image scanners, touch panels, light pens, and voice systems as common input devices. For output devices it mentions dot matrix printers, laser printers, and plotters. The document provides images to illustrate examples of different devices like virtual keyboards, foldable keyboards, optical mice, trackballs used in mice, mobiles and remote controls, data gloves, image scanners, touch panels, dot matrix printers, laser printer internal components, and plotters.