Final answer:
Ports on the system unit are used to connect hardware devices such as keyboards, printers, and monitors. They facilitate communication and data transfer between the computer and the external devices.
Step-by-step explanation:
Ports, located on the outside of the system unit, are used to connect hardware devices. These hardware devices can include peripherals like printers, monitors, keyboards, and mice. Ports come in various types and serve different purposes. For example, USB (Universal Serial Bus) ports are commonly used for a wide range of devices, while HDMI (High-Definition Multimedia Interface) ports are typically used for high-definition video and audio connections.
Each port on a computer's system unit acts as an interface between the computer and external devices, enabling communication and data transfer. The importance of these ports lies in the fact that they allow for expansion of computer functionality and are essential for nearly all computer operations that involve external hardware.