Network Interface Card (NIC) is also referred to as an Ethernet card. Its also caled network adapter. It is an expansion card that enables a computer to connect to a network; such as a home network, or the Internet using an Ethernet cable with an RJ-45 connector. NICs are used for a wired connection
Its provides with a dedicated, full-time connection to a network. Personal computers and workstations on a local area network (LAN); typically contain a network interface card specifically designed for the LAN transmission technology.
Due to the popularity and low cost of the Ethernet standard, most new computers have a network interface build directly into the motherboard. Figure 2.8 show a different type of NIC cards.