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Wi-Fi or WiFi is a technology for wireless local area networking with devices based on the IEEE 802.11 standards. Wi-Fi is a trademark of the Wi-Fi Alliance, which restricts the use of the term Wi-Fi Certified to products that successfully complete interoperability certification testing.
Well, to the end user (when it's working), it's magical. You plug up a Wi-Fi router (sometimes provided by your internet company) and it is suppose to just work. The truth is that Wi-Fi is incredibly complex. Wi-Fi works by using RF (radio frequency waves) and turning them into data using what is called the 802.11 protocol. You've probably seen this on your router box as 802.11g or 802.11n (802.11ac is the current standard).