"Wifi" means "wireless fidelity". The term "wifi" refers to certain kinds of wireless local area networks, or WLAN (as opposed to LAN, or computers that are networked together with wires).
Travelers with PDA's (like Blackberries) and other handheld devices or laptops with wireless cards can connect to the internet via wifi. A wireless card is like a modem without a phone line (like an airport card in a Mac).
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