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802.11

a family of IEEE standards for wireless LANs that were designed to extend 802.3 (wired Ethernet) into the wireless domain. The 802.11 standard is more widely known as "Wi-Fi" because the Wi-Fi Alliance, an organization independent of IEEE, provides certification for products that conform to 802.11

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802.11a

54 Mbit/s, 5 GHz standard (1999, shipping products in 2001)

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802.11b

enhancements to 802.11 to support 5.5 and 11 Mbit/s (1999)

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802.11g

54 Mbit/s, 2.4 GHz standard (backwards compatible with b) (2003)

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802.11i

an IEEE standard security protocol for 802.11 wireless networks that was developed to replace the original WEP protocol. Also known as "Robust Security Network" (RSN), 802.11i provides sophisticated authentication using a variety of protocols (802.1X, EAP and RADIUS) and strong security with the AES-CCMP encryption protocol. However, in order to allow in-place upgrading of older WEP hardware, 802.11i also supports the TKIP protocol, which is less robust than AES-CCMP, but far superior to WEP

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802.11n

an enhancement to the IEEE 802.11 wireless network standard that increases transmission speeds to 108 Mbps and beyond. Expected in the 2006 time frame, there are two competing technologies, although both of them are MIMO based, which uses multiple transmitters and receivers.

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802.16

see WiMAX