RJ-45
Short for Registered Jack-45, a RJ-45 is a 8-pinconnection used for Ethernet network adapters. This connector resembles to the RJ-11 or 6-pin connector used with telephones in the United States but they're completely different.
In the picture to the right, is an example image of what the RJ-45 looks like separate from the cable.
Also see: Cat5, Connection, Network definitions, Network card, RJ-11