Three categories of peripheral devices exist based on their relationship with the computer:
- an input device sends data or instructions to the computer, such as a mouse, keyboard, graphics tablet, image scanner, barcode reader, game controller, light pen, light gun, microphone, digital camera, webcam, dance pad, and read-only memory);
- an output device provides output from the computer, such as a computer monitor, projector, printer, and computer speaker); and
- an input/output device performs both input and output functions, such as a computer data storage device (including a disk drive, USB flash drive, memory card, and tape drive) and a touchscreen.
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- Laplante, Philip A. (2000). Dictionary of Computer Science, Engineering and Technology. CRC Press. p. 366. ISBN 0-8493-2691-5. Archived from the original on September 23, 2016. Retrieved January 16, 2018.