An Ethernet cable is a type of network cable used to connect devices on a Local Area Network (LAN). It is a twisted pair cable composed of four pairs of copper wires, which are used to transmit data at speeds of up to 10 Gbps. Ethernet cables are available in a variety of lengths and colors, and are used to connect computers, routers, switches, and other network devices. They are also used to connect to the internet, and are the most common type of cable used in home and office networks.