Most people just refer to their wireless LAN as Wi-Fi. Which is good — we like simple names that everyone knows. But Wi-Fi actually covers a range of technologies, all part of the IEEE 802.11 family of standards, and each of these technologies differs in both its capabilities and its compatibility with other Wi-Fi gear. This table provides a quick, at-a-glance view of the four main 802.11 Wi-Fi variants, what frequencies they use, how fast they are, and how they work with other versions of 802.11.
| Wireless LAN Technology | Frequency | Maximum Speed | Compatibility | Availability |
|---|---|---|---|---|
| 802.11b | 2.4 GHz | 11 Mbps | 802.11g | Obsolete, still supported in network adapters |
| 802.11a | 5 GHz | 54 Mbps | 802.11n (where 5 GHz is supported, at 54 Mbps) | Obsolete, still supported in network adapters |
| 802.11g | 2.4GHz | 54 Mbps | 802.11b (at 11 Mbps) | Now |
| 802.11n | 2.4 GHz or 5 GHz (not all support 5 GHz) | 300 Mbps | 802.11g (at 54 Mbps); 802.11b (at 11 Mbps); 802.11a (at 54 Mbps where 5 GHz is supported) | Now |
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Source:http://www.dummies.com/how-to/content/explore-wireless-lan-wifi-technologies.html
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