It's an Ethernet port used for network connections.
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cat 5 Ethernet cable
The ports are available to see on the front and back of your computer. For instance the RJ45 port is the port that you plug in the cable to get to the Internet. If you want to see where the ports are located on the inside, just open your case and you will see them along the back of your computer. For instance, your keyboard is connected to a input port.
RJ stands for Registered Jack
1. Physical layer
1. Physical layer