Wi-Fi (noun) Short for “wireless fidelity.” Used generically to refer to any type of 802.11 wireless Internet network.
In the past, wireless access was as simple as sliding a card into a slot on the side of a PC. Now, it's even easier: Most new PCs have Wi-Fi cards built in. The card acts like a radio transmitter and receiver. All you need is an access point (an antenna, in old-speak) that is connected by wire to the Internet.