What is the role of a network interface card (NIC)?

A network interface card (NIC) plays a critical role in facilitating communication between a computer and a network. Its primary function is to connect the computer to a local area network (LAN) or the internet, enabling data transfer and network access. The NIC acts as a bridge, converting data from the computer into a format suitable for transmission over the network and vice versa.

This capability is essential for various networking tasks, such as joining a network for file sharing, internet access, or connecting to other devices. NICs can be wired, utilizing Ethernet cables, or wireless, using Wi-Fi technology, but in both cases, they are integral to establishing connectivity.

In contrast, options relating to improving graphical performance, enhancing sound quality, or securing data through encryption describe entirely different components and functions. These aspects do not pertain to the primary function of a NIC, which is solely focused on network connectivity.