A NIC is a Wi-Fi adapter that is built into the device. Also, a NIC is an adapter card that plugs into the motherboard, and is connected through network cabling to the network. Lastly, a NIC is a USB adapter that can connect to the Wi-Fi network.
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Specification
A network interface card (NIC) is a hardware component, typically a circuit board or chip, which is installed on a computer so it can connect to a network.