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WiFi is the nickname for Wireless Fidelity - high speed internet and network connection without the use of wires, cables and other stuff you can trip over.
But such speculation is overblown. Wi-Fi is a short-range technology that will never be able to provide the blanket coverage of a mobile network. Worse, subscribe to one network of hotspots (in coffee-shops, say) and you may not be able to use the hotspot in the airport.