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Wi-Fi does NOT stand for Wireless Fidelity. It doesn't stand for anything. It certifies that different wireless products based on the 802.11 standard work properly together. For example, if you have a Wi-Fi certified laptop you should be able to use any other Wi-Fi certified network around the world. It doesn't mean the WLAN itself but a certification that a specific WLAN is Wi-Fi certified. A product is Wi-Fi if it fulfills certain requirements specified by the Wi-Fi Alliance. But people often use Wi-Fi to designate WLAN.