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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.
Wireless broadband â or Wi-Fi â is a broadband connection to the internet that's accessed without cables. This is different from 3G or 4G mobile broadband, which uses mobile phone signals. With Wi-Fi, it's only the connection between your computer and the router that is wireless, not the actual broadband connection itself.