An input device is used to provide data and control signals to an information processing system such as a computer. A keyboard is an input device because it allows a user to input alphanumeric data into a computer. A monitor is an output device that displays information to the user, a speaker produces audio output, and a printer provides printed output making them incorrect choices for this question.
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What are some other examples of input devices?
How do input devices communicate with computers?
Why is it important to differentiate between input and output devices?