The Wi-Fi Alliance is a trade association that promotes Wireless LAN technology and certifies products if they conform to certain standards of interoperability. Not every IEEE 802.11-compliant device is submitted for certification to the Wi-Fi Alliance, sometimes because of costs associated with the certification process. The lack of the Wi-Fi logo does not necessarily imply a device is incompatible with Wi-Fi devices.
The Wi-Fi Alliance owns the Wi-Fi trademark. Manufacturers may use the trademark to brand certified products that belong to a class of wireless local area network (WLAN) devices based on the IEEE 802.11 standards.
Read more about Wi-Fi Alliance: History, Wi-Fi Certification, List of WFA Certification, Wi-Fi Direct Specification
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