Which component is responsible for handling wired networking connections?

The component responsible for handling wired networking connections is the Network Interface Card (NIC). A NIC is specifically designed to connect a computer or device to a network using physical cabling, such as Ethernet. This functionality allows devices to communicate with each other over a local area network (LAN) or connect to the internet.

The NIC serves to convert the data into a format suitable for transmission over the network and is typically integrated into the motherboard or provided as a separate expansion card. It manages the data packets sent and received, and often includes features such as error checking and addressing to ensure that the information exchanged is both accurate and reliable.

In contrast, the other components do not serve this specific function. The video card is dedicated to rendering images and videos, the motherboard serves as the main circuit board that connects all components, and the power supply unit is responsible for providing electrical power to the computer's components. Each of these has crucial roles within a computer system but does not relate to wired networking directly.