In my opinion WiFi is sufficient for wireless connection for local use. WiFi technology make it possible to connect two or more computer or devices to share date by mean of wireless connection. This technology is being used in number of devices like mobile phones, laptops, PDA’s, mp3 player etc. You can send and receive data faster then any other previous wireless technology.
Before wifi, infra-red and Bluetooth wireless technologies are being in use and still in use. Using Bluetooth you can share data with other devices but the data transmission rate is much lesser than the Wifi. moreover the range of Bluetooth is also less than the range of Wifi wireless connection. As the range of WiFi connection is around 20 meters. The range of infra-red is lesser than Bluetooth. To make a wireless connection between any two devices using infra-red, you have to place both device parallel i.e in front of each other else you feel very difficulty in making connection or there is no connection.
A new technology Wimax is also in use for wireless connection. it has been designed to communicate at long distance, but it is also slower than wifi. Wimax uses licensed and unlicensed spectrum but the Wifi uses only unlicensed spectrum.