The IEEE 802.11 working group published the 802.11 standard for wireless LANs in 1999. 802.11b is a supplement to 802.11 that specifies a higher data rate and is currently the industry accepted standard for WLANs. 802.11b products that meet a base standard of interoperability are certified by the Wireless Ethernet Compatibility Alliance (WECA) with the Wi-Fi™ logo. Several IEEE 802.11 working groups are creating standards for improvements in data rates, quality of service, and security.
Wi-Fi is not a fully wireless LAN. It is an extension to the existing wired network. By using device called Access Point (AP) wireless nodes can be connected to the wired network. Otherwise wireless nodes has to be connected in AdHoc style. Its typical coverage area is 100 to 500 feet.Wireless LANs give the enterprise more mobility and flexibility by allowing workers to stay connected to the Internet and to the network as they roam from one coverage area to another. This increases efficiency by allowing data to be entered and accessed on site.