iLink is a trademark of the Sony Corporation. It refers to the standard defined by The Institute of Electrical and Electronics Engineers (IEEE) as IEEE-1394. You may also know this standard as FireWire, which is a trademark of Apple Corporation. IEEE-1394 is one of the fastest methods of external data transfer today, capable of 400 Mbps. I will refer to the IEEE-1394 standard as "1394" or "iLink" in this document. On the PS2, the iLink port is labeled by the "S400" and the arrow. (It's next to the USB ports on the front of the console.) As you can tell by looking in the port, this is a 4-pin 1394 port. Currently the iLink is solely for the setup of a multiplayer network involving multiple PS2 consoles. In other words, you can connect one console (with TV and everything else one player alone would need to play a certain game) to other PS2 systems (each with everything one player alone would need to play that game) and play with or against other plyers. It can be used for games such as Armored Core 2, Unreal Tournament, Gran Turismo 3, and a few others not listed. Neither SCEA nor Sony makes first-party iLink peripherals for PS2.