RJ-45 stands for Registered Jack-45.

RJ-45 is an eight-wire connector, which is commonly used to connect computers on the local area networks (LANs) especially Ethernets.

Ethernet is basically a LAN architecture developed by Xerox Corp along with DEC and Intel. Ethernet uses either a bus or star topology and supports the data transfer rates of upto 10Mbps.

The RJ-45 connector looks very much similar to the standard telephone connector (RJ-11 connector), but it is wider than the RJ-11 connector, as it houses eight wired instead of four.

The RJ-45 connectors are used to connect computers in Ethernet LANs.

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