Ethernet network interface is a device that connects a computer to a local area network (LAN) using an Ethernet cable. It is a physical layer device that provides a connection between the computer and the network. It is responsible for sending and receiving data packets over the network. It also provides a link between the computer and the network, allowing the computer to communicate with other devices on the network. Ethernet network interfaces are available in various speeds, ranging from 10 Mbps to 10 Gbps. They are also available in different form factors, such as PCI, USB, and PCIe.