Which of the following is classified as an input device?

A keyboard is classified as an input device because it is specifically designed to allow users to enter data and commands into a computer system. The primary function of a keyboard is to convert keystrokes into a format that the computer can process, thus enabling the user to interact with the system effectively.

Input devices like keyboards are essential for providing commands, entering textual information, and performing various tasks within software applications. This interaction is a fundamental aspect of computing, as it enables users to communicate their intentions to the computer.

In contrast, devices such as printers and monitors are categorized as output devices because they display or produce results from the data processed by the computer. A printer produces hard copies of documents, while a monitor displays visual output. Similarly, speakers serve the purpose of outputting audio signals. The distinction between input and output devices is crucial in understanding how computers operate and process information.