Wi-Fi is the name given to the Institute of Electrical and Electronics Engineers 802.11 wireless connectivity standard by the Wireless Ethernet Compatibility Alliance. Wi-Fi allows wireless networking with the use of a router that broadcasts and receives data transmissions to and from Wi-Fi enabled devices.
Wi-Fi connects multiple computers and wireless devices together into a network or connects a network of devices to the Internet. Wi-Fi, unlike 3G and 4G wireless data networks, is only available in areas within range of an open network signal, whereas 3G and 4G wireless networks connect nearly everywhere that major cellular networks reach. Advantages of Wi-Fi over 3G and 4G include faster data speeds due in part to Wi-Fi connection points generally being much less congested than cellular networks.