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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.
Wi-Fi (802.11x standard) Wi-Fi is a term for certain types of wireless local area networks (WLAN) that use specifications in the 802.11 family -- for example, Wi-Fi Direct, a peer-to-peer specification that allows devices certified for Wi-Fi Direct to exchange data without an internet connection or a wireless router.