Several posts up...
Routers do packet routing. they may even sub in there own mac address when connecting networks. In technical terms they parse iso layer 3 information.
Switchs track/remember down which port a MAC address is located so as to cut down on traffic going out the wrong port. In technical terms they maintain a iso layer 2 information table.
Hubs act as multiport repeaters. Whatever comes in on any port is amplified and sent down all other ports. Very noise on a network. In technical terms this and a repeater are iso layer 1 devices.
Repeaters (almost never used anymore) amplify the signal coming in one port and send it out the other. (note it has only two ports.)
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