Hey friends I am using data card for ne from a month, today my cousin came home and we were playing online games so he told me to use Wi-Fi instead if data card that time even I said yes. But to br frank I don’t know that what Wi-Fi technology is. So i want some info about Wi-Fi ….is it a device for free internet or something like modem of internet? Please provide me with as much info links as possible so that it can be clear to me?