The function of a network interface card (NIC) is to enable a computer or device to connect to a network. It serves as the interface between the device’s internal components and the network infrastructure, which can be wired or wireless. A NIC converts digital data from the computer into a format suitable for transmission over the network, handling tasks related to data transmission and reception. Additionally, it facilitates protocol processing, ensuring that data packets are correctly formatted for communication across the network, thus enabling effective connectivity.