(Local Area Network port) An RJ-45 Ethernet socket on a computer or network device such as a switch or router. All client machines, servers and network devices on the local network are cabled together at their LAN ports. Contrast with WAN port. See RJ-45.
RJ-45 Ethernet Plug and Socket
RJ-45 plugs and sockets look like telephone plugs and sockets, only larger. Every non-portable electronic device that requires an Internet connection has an RJ-45 port.