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An input device is a piece of hardware that allows a user to send data and control signals to a computer or other information processing system. It translates human actions or physical conditions into electronic signals that the computer can understand, acting as a link between the user and the machine. Common examples include a keyboard, mouse, microphone, and scanner.

Function: Input devices enable users to interact with and control a computer by entering data, commands, and instructions. They are essential for tasks like typing text, pointing and clicking, recording audio, and scanning documents.

Interaction: They are the "senses" of a computer, allowing for user interaction through physical actions such as key presses, mouse movements, spoken words, or touch gestures on a screen.