What is a common peripheral device used to input information into a computer?

A keyboard is a common peripheral device used to input information into a computer because it allows users to enter text, commands, and other data directly into the system. Keyboards contain various keys that correspond to letters, numbers, and functions, making them essential for tasks such as typing documents, entering data into forms, and executing commands. They facilitate communication between the user and the computer, acting as the primary means of input for most computing tasks.

In contrast, monitors, printers, and speakers do not serve as input devices. Monitors display information processed by the computer, printers produce hard copies of documents and images created by the computer, and speakers output audio signals generated by the computer. Each of these peripherals plays a crucial role in the overall functionality of a computer system, but they do not contribute to the input of information.