A network card (NIC (Network Interface Card)) is used to connect to your modem or router to access the network / internet. This can either be a cabled (LAN) network card or a wireless network card. An onboard LAN card is normally found on nearly all motherboards. Addition network cards can be plugged into PCI expansion slots. Each network card has a unique serial number, which is called a MAC address. The MAC address is used to define and locate a computer on a network.
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