AppleCorporation's name for their WirelessEthernet (aka WiFi) technology. They sell AirPort hubs and cards; the latter go in a special PC card slot that is in all Macs since 2000(?). AirPort Extreme is 802.11g (more recent and faster than the original 802.11b). AirPort and AirPort Extreme both interoperate with other 802.11??? equipment.
Resources:
A weblog about AirPort -- http://wireless-starter-kit.com/airportblog/
Passwords: SSIDs are the things that show up in your AirPort menu | A WEP key is what you enter where the Mac asks for a password. Put a $ before long passwords.
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Mac as WiFi repeater | Look inside an AirPort hub. | Stumbling: MacStumbler, Kismac