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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.
WiFi is a wireless networking technology that allows computers, some mobile phones, ipads, game consoles, and other devices to communicate over a wireless signal. The same way a radio can tune into a radio station signal over the airwaves, your device can pick up a signal that connects it to the internet, thru the air. As a matter of fact, a WiFi signal is a high-frequency radio signal.