A network Ethernet card is a device that allows a computer to connect to a network. It is a hardware component that is installed in a computer and provides a physical connection to the network. It is also known as a network interface card (NIC) and is used to connect a computer to a local area network (LAN). The Ethernet card is responsible for sending and receiving data over the network. It is also responsible for providing an IP address to the computer so that it can communicate with other computers on the network.