Composition of input unit
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Explanation:
In computing, an input device is a piece of 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 camera]The]s, joysticks, and microphones.
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A common computer input device, a keyboard. A user presses a key which transfers information to a computer.
Input devices can be categorized based on:
modality of input (e.g. mechanical motion, audio, visual, etc.)
whether the input is discrete (e.g. pressing of key) or continuous (e.g. a mouse's position, though digitized into a discrete quantity, is fast enough to be considered continuous)
the number of degrees of freedom involved (e.g. two-dimensional traditional mice, or three-dimensional navigators designed for CAD applications)