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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.
Related Terms. Wi-Fi is the name of a wireless networking technology that uses radio waves to provide high-speed network and Internet connections. This Webopedia Did You Know... article explains Wi-Fi technology: how it works and misconceptions about Wireless Fidelity. Wi-Fi Definition: What is Wi-Fi.