Wi-Fi is short for “Wireless Fidelity”, which stands for wireless fidelity, in English. Wi-fi, or wireless is a technology which does not make use of cables, and is usually transmitted via radio frequency, infrared etc.
Wi-fi requires no license for installation and/or operation. To access a wi-fi network it is necessary to be in the area of an access point, called a hotspot, or in public places that have wi-fi. To use, you must have a mobile device such as laptop, tablet or mobile phone, you can access the internet with ease.
Some people confuse free internet wi-fi, which is a mistake, because wi-fi means just that place has wireless internet, but in public places such as restaurants, airports, shopping malls etc, it is necessary to pay a fee or purchase a product to take advantage of the benefit.
Currently, virtually all notebooks come standard with devices to access wi-fi.
Reference Website: http://www.abbreviationfinder.org/acronyms/wifi.html