A Network Interface Card, often abbreviated as NIC, is an expansion board that is sometimes installed on the motherboard of a computer to enable communication with other computers connected to a network. Most NIC's are designed for a particular type of network, protocol, and media, although some can serve multiple networks.
The PCs are usually connected by some type of cabling, usually an advanced type of phone-cable or coaxial cable. Network cards (NIC's) provide the interface between the network and computer's. A NIC can be recognized by any of these connectors: a RJ45, BNC, 15-pin female DB, or 9-pin female DB. It is very common to see NIC's with more than one type of connector. Probably the most common combination: NIC has an RJ-45 and a BNC.
