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Input device. A common computer input device, a keyboard. A user presses a key which transfers information to a computer. In computing, an input device is a peripheral (piece of computer hardware equipment) used to provide data and control signals to an information processing system such as a computer or information appliance. Examples of input devices include keyboards, mouse, scanners, digital cameras and joysticks.
a monitor is an output device because you cannot give the computer any commands with it, like you can with mice and keyboards. There is one contingency, however. If you have a touch-screen monitor, then it is an input device, because you are interacting with the computer with it.