Wi-Fi is the most commonly used wireless communications technology which is based on Electrical and Electronics Engineers (IEEE) wireless communication standard 802.11. This standard makes specifications about wireless local area networks ( WLANs).

Wi-Fi Technology is a trade-mark of a global non-profit association formed by worldwide network of companies, named Wi-Fi Alliance. The trademark term "Wi-Fi" is adopted  in 2000. The 802.11 standard adopted by Wi-Fi was initially released in 1997 before even Wi-Fi Alliance formed, where standard specifications made in 1997 is superseded by specifications in  1999, 2007, 2012 and 2016 respectively.

Therefore, at the moment of writing, latest 802.11 standard depends on the specifications made in IEEE 802.11-2016. The usage of channels and frequency spectrum width for WLAN in 2.4GHz band may differ in different regions of the world as in the US and Europe. 

Being the most common wireless technology, this technology is used in many indoor environments already. Moreover, Wi-Fi signal has signal strength value indicator which decreases as the distance traveled by this signal increases which makes this technology usable in indoor positioning systems(IPS)