RJ45

A USOC code identifying an eight-pin modular plug or jack used with unshielded twisted-pair cable. Officially, an RJ-45 connector is a telephone connector designed for voice-grade circuits. Only RJ-45-type connectors with better signal handling characteristics are called eight-pin connectors in most standards documents, though most people continue to use the RJ-45 name for all eight-pin connectors.

RJ-45 (Registered Jack 45) – standard for connecting UTP cabling. They are inexpensive and easy to install onto UTP cable.  Used to connect devices transmitting data over local-area networks (LAN), especially Ethernets.