What is the purpose of a Network Interface Card (NIC)?

The purpose of a Network Interface Card (NIC) is to facilitate communication between a computer and a network, which can include connecting to high-speed Internet via a cable modem. The NIC is responsible for converting the data from the computer into a form that can be transmitted over the network and vice versa, ensuring that data is transferred efficiently and correctly. This function is crucial for enabling online activities such as browsing the web, streaming media, or participating in online gaming, all of which depend on the network connection provided by the NIC.

While the other options mention components and functionalities related to a computer, they do not pertain to the primary role of a NIC. Providing additional power to the motherboard relates to the power supply unit, increasing storage capacity refers to storage devices like hard drives and SSDs, and enhancing audio and video performance is associated with sound and graphics cards.