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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 only used to display (output) information from a computer and provides no source of input. For this reason, a computer monitor is considered an output device. Note: Newer PCs have touchscreen monitors, which allow the user to interact with their computer by touching what is shown on the screen with their finger. If the monitor has touchscreen capabilities, it is considered an Input/Output devices.