HUB

A little device that is used to network multiple computers together. It is a central connection for all the computers in a network, which is usually Ethernet-based. Information sent to the hub can flow to any other computer on the network. So basically, if you're planning on connecting more than two computers together, go get a hub. If you only need to network two computers together, a simple crossover Ethernet cable will work and you don't even need a hub.