What is the function of a peripheral device in a computer system?

A peripheral device plays a crucial role in expanding the functionalities of a computer system by connecting externally to the main computer and providing additional capabilities that are not built-in. This includes a variety of devices such as printers, keyboards, mice, external hard drives, and scanners. The primary function of these devices is to enhance the user's interaction with the computer or to assist in the input and output processes.

Connecting peripherals allows users to perform tasks such as printing documents, entering data, or expanding storage capacity, thereby making the computer system more versatile and easier to use for specific tasks. The proper integration of these devices is essential for a comprehensive computing experience, as it allows the computer to fulfill a broader range of purposes aligned with user needs.

In contrast, other options refer to functions that do not typically describe peripherals. For example, while some devices are involved in storing data, that is not the primary role of all peripherals. Similarly, processing data is an internal function that is typically reserved for the computer's central processing unit (CPU), and powering a computer system is primarily the function of the power supply, not peripherals. Therefore, connecting to add functionality aptly captures the essence of what peripheral devices do in a computer system.