RJ45 or LAN - Local Area Network
or the cable they use to connect computers together in an Internet Cafe.

These photos are part of newsletters of Andy HoboTraveler.com World Travels
Newsletter # 143

RJ45 Plug - A bigger version of the telephone jack plug.

There are two connections The one on the left of my Compaq computer is for the
LAN or RJ45 Plug the on on the right is for a normal telephone jack or the line for a dial up modem connection.