The keyboard of a computer is classified as an "input device". An input device is any hardware component that allows you to enter data and commands into a computer. The keyboard is one of the most commonly used input devices, as it allows you to type text, numbers, and symbols into the computer. The information you type on the keyboard is then processed by the computer's central processing unit (CPU) and can be used to perform various tasks, such as writing a document or playing a game. The keyboard is an essential component of a computer system, as it provides a way for users to interact with the computer and control its functions.