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Wi-Fi (IPA /'wa?fa?/) is a trademark of the Wi-Fi Alliance originally founded in 1999 as WECA (Wireless Ethernet Compatibility Alliance). The organisation comprises of more that 300 companies, whose products are being certified by the Wi-Fi Alliance basing on the IEEE 802.11 set of standards (also called, W-LAN, Wireless LAN, Wireless Local Area Network or colloquial WiFi). This certification grants the interoperability between different wireless devices. The reason for founding the alliance was, that in many products the IEEE 802.11 standards were not implemented correctly/entirely and some of them had proprietary extensions. This led to many incompatibilities between products from different manufacturers. The Wi-Fi Alliance tests the wireless components by their own terms of reference. Products that pass the test get the Wi-Fi certificate and are allowed to wear the Wi-Fi logo. But only the products of the Wi-Fi Members are being tested, as they pay a membership fee and a per-item-fee. According to that, a missing Wi-Fi logo does not necessarily mean an aberration from the standard. In some countries (USA, France, Poland...) the term "WiFi" is often used by the public as a synonym for W-LAN although not every W-LAN product has a WiFi certification. This is due to certification costs that have to be payed for every single certified device.
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