Built by the Wi-Fi Alliance, Wi-Fi is a radio wave based technology that provides network connectivity between devices.
Devices connect to a wireless local area network (WLAN). WLAN is also the official definition of Wi-Fi according to the Wi-Fi Alliance.
Wi-Fi is an abbreviation of two words, however, no official full name has been released. Most people in the tech industry accept Wireless Fidelity as the full name for Wi-Fi.