Wireless Fidelity, more known by its short form Wi-Fi, is a digital communications protocol, through which gadgets can communicate with each other in [[wysiwyg_imageupload::]]a unicast or a broadcasting manner without using any wires. Being a wireless protocol, Wi-Fi standard uses the ISM (Industrial, Scientific and Medical) band of frequency which are free to use and require no licensing. Launched in 2.4GHz with transmission rates of 1-2mbps, Wi-Fi now works at 5GHz frequency also with astounding data transmission rates reaching upto 54mbps at both frequencies. Wi-Fi is a marketing term applied to 802.11b IEEE standard, but it now ubiquitously used for all the standards that fall under 802.11 category of Wireless LAN. So, Wi-Fi defines 802.11 x standards where x is the respective Wi-Fi version.  Popular Wi-Fi version are a, b, g and n. The term “Wi-Fi” was added only to make the standard more common and rhyming with “hifi”, it was later that “wireless fidelity” took the full form of this term.