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Wi-Fi From Wikipedia, the free encyclopedia. Wi-Fi is a set of standards for wireless networks? based on the 802.11 Wireless Ethernet standards. Wi-Fi was intended to be used for wireless LANs, but is now often also used for Internet access. Wi-Fi (for "Wireless Fidelity") is a trademark of the Wireless Ethernet Compatibility Alliance (WECA), the trade organization that defines the Wi-Fi standards. There are at least two types of Wi-Fi, each based on an 802.11 standard. 802.11b enjoy international acceptance because the 2.4-GHz band is almost universally available. In the United States 802.11a, which operates around 5 GHz, enjoys relatively clear-channel operation. In other areas, such as the EU, 802.11a is not yet approved for operation in the 5 GHz band, and European regulators are still considering the use of the European HIPERLAN standard.