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The function of an input device is to communicate information to a computer or other sort of information processing equipment. Input devices are types of peripheral devices that communicate with processing units.
The most common forms of input device for personal computers are keyboards and mice. A keyboard allows a user to input alphanumeric information to a computer, and is considered a discrete input device, as it only can input fixed or discrete types of information.
Another type of input device is a tracking device that communicates spatial information. Types of tracking devices include mice, trackballs, touch pads, and joysticks. Mice with buttons actually are hybrid devices, able to input discrete information in the forms of clicks or tracking information.
Other processing systems can be activated by sound. These might include sound activated devices or more complex forms of voice recognition technology.
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