Wi-Fi is a technology that uses radio waves to provide network connectivity. It stands for wireless frequency. It commonly uses the 2.4 gigahertz UHF and 5 gigahertz SHF ISM radio bands. With the help of Wi-Fi, we can have a very fast access to internet which can be used for service like checking an email, downloading as well as watching songs and movies, checking updates etc. Wi-Fi service is provided free of cost by governments at some places like the railway stations or bus stations. In order to connect to a Wi-Fi, a device has to be equipped with a wireless interface connection. Its range depends on Wi-Fi router. Wi-Fi can be used in Mobile phones, laptops, personal computer, tablets, smart TVs, gaming consoles etc.