What is IEEE 802.11?
802.11 operates in the same unlicensed frequency range as Bluetooth and HomeRF. It is optimized for data transmission up to 100 meters within offices and campus LANs. The specs are based upon wired ethernet technology. As such, 802.11 behaves similarly to wired ethernet when transmission problems occur: It waits, then retransmits in response to interference. This works well with data but not necessary with voice or other applications that benefit from some amount of guaranteed throughput.
There are subsections within the spec. The most commonly deployed variant is 802.11b, often referred to simply as "802.11". A higher speed variant (confusingly enough named 802.11a) is also on the rise.