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. https://www.gearbest.com/blog/how-to/what-is-the-difference-between-wlan-and-wifi-2831
blog article
WHAT IS THE DIFFERENCE BETWEEN WLAN AND WIFI?
WiFi is included in WLAN: As a matter of fact, WiFi is a trademark of WLAN (Wireless Local Area Network Alliance), which guarantees the cooperation of this trademark goods but have nothing to do with the standard itself. Since WiFi mainly uses 802.11b protocol, people are gradually accustomed to calling 802.11b protocol with WiFi. From the inclusion relation, WiFi is a standard of WLAN, and WiFi is included in WLAN, belonging to a new WLAN technology. STEVE LOWRY READ MORE