Which of the following describes an input device?

The correct choice highlights a fundamental role of input devices in the computing ecosystem. Input devices are designed to allow users to provide data and control signals to a computer, enabling interaction with the system. This includes devices like keyboards, mice, and scanners, which facilitate the entry of information and commands that the computer can process.

Understanding this function is essential as it distinguishes input devices from other categories such as output devices, which are responsible for presenting information after processing, and storage devices, which are meant to retain data. Similarly, devices that enhance visual display capabilities fall under a different category, focusing on output rather than the input aspect crucial for user interaction with the system. Knowing the specific definition and functionality of input devices is key in grasping the broader concepts of computer hardware and its operation.