Network Interface Card (NIC) What is a Network Interface Card (NIC)? A Network Interface Card (NIC) is a hardware component that connects a computer or device to a network, enabling data transmission and communication. Explanation NICs can be wired or wireless, depending on the network type. They are essential for devices to communicate over LANs, WANs, or the internet. Practical Example of a NIC A desktop computer is equipped with a NIC to connect to a high-speed Ethernet network for fast data transfer and internet access.