802.11 is a set of technical specifications for networking and wireless communication, standardized by IEEE.
There are several variants of 802.11. The most common is 802.11b, also known as Wi-Fi, which provides speeds up to 11 mbs. 802.11g and 802.a are faster versions. Many 802.11g and 802.11a products are backward-compatible with the original 802.11b.