The advantage of Wi-Fi is that it is a completely wireless Local Area Network ( WLAN) system. It can be used to access the Internet. Wireless internet can be used in hotels , cafes , universities , airports and other important places using LAN . Good frequency is available in IEEE 802.11b and 802.11g standards. Wi-Fi card can be used to talk at the same time without interruption. Wi-Fi networks do not require government approval.