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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 is the implementation of Wireless LAN. Wireless LAN describes the broader concept of wireless networked communications between machines. Wi-Fi is a trademark that can be used on devices that meet the 802.11 standards. Wi-Fi is used by a variety of devices to allow them to connect to wireless networks and the Internet.