WiFi Standard -802.11
In 1997, the IEEE created the first WLAN standard. First Standard 802.11 supported maximum Speed Of 2Mbps.
WiFi Standard -802.11b
802.11b supports bandwidth up to 11 Mbps makes use of 2.4GHz unregulated radio signaling frequency .
WiFi Standard -802.11a
802.11a supports bandwidth up to 54 Mbps and signals in a regulated frequency spectrum around 5 GHz. This higher frequency compared to 802.11b shortens the range of 802.11a networks.
WiFi Standard -802.11g
802.11g attempts to combine the best of both 802.11a and 802.11b. 802.11g supports bandwidth up to 54 Mbps, and it uses the 2.4 Ghz frequency for greater range.
WiFi Standard -802.11n
It was designed to improve on 802.11g in the amount of bandwidth supported by utilizing multiple wireless signals and antennas . 802.11n connections offer data rate of over 100Mbps.