A network interface card (NIC) is a circuit board or card that is installed in a computer so that it can be connected to a network.
A network interface card provides the computer 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
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See also: PCMCIA card, WAN interface card, network interface unit, converged network adaptor