An input device provides data and control signals to a computer. Examples include keyboards, mice, scanners, cameras, joysticks, and microphones. A microphone converts sound into electrical signals while a mouse controls cursor movement and selection. Other input devices described are light pens, which allow screen pointing and drawing, and joysticks, which report directional movement. Output devices convert information into human-readable form like text, graphics, audio and video. Examples are computer monitors that display images, speakers that generate sound, plotters that print vector graphics using pens, and printers that transfer information to paper.