This document summarizes common hardware components used for input, output, and input/output in computing. It describes keyboards, mice, microphones, scanners, and webcams as examples of input devices that allow communication between users and computers. Output devices mentioned include monitors, printers, speakers, and plotters used to communicate information from computers to the outside world. Input/output devices listed are able to both receive input and output data, such as floppy disks, touch screens, hard disks, modems, and USB memory drives.