What is the primary function of a Power Supply Unit (PSU) in a PC?

The primary function of a Power Supply Unit (PSU) in a PC is to provide electrical power to the computer's components and convert alternating current (AC) from the wall outlet into direct current (DC) that the components can use. The PSU is essential for ensuring that various parts of the computer, such as the motherboard, CPU, and storage devices, receive the correct voltage and power needed for operation.

By converting AC to DC, the PSU makes it possible for the computer to power its components efficiently, as most internal components operate on low-voltage DC power. Additionally, the PSU often includes connectors for various components and may have features like voltage regulation and overcurrent protection to ensure stable and safe operation.

The other options describe functions that are not specific to the PSU. For example, data storage is the role of hard drives or SSDs, while managing cooling and airflow is typically the responsibility of fans and heat sinks. Enhancing audio and video performance involves graphics cards and sound cards. Therefore, the correct answer focuses precisely on the unique and critical function of the PSU in a computer system.