WEP, WPA, and WPA2

I need help in understanding the differences between WEP, WPA, WPA2, and how they work.

Thanks

WEP/WEP2 and WPA/WPA2 are encryption technologies used in wifi connections. The only difference between WEP and WEP2 is the stronger 128bit key that the later uses. Likewise WPA2 offers all the features of WPA, adding stronger encryption, by implementing AES instead of TKIP. WPA in general uses additional tehniques and more efficient approaches to deal with WEP's issues. For more details have a look at the following articles, there's plenty more documentation if you make a search at the web.

Wi-Fi Protected Access (WPA) NeedToKnow
802.11 WEP: Concepts and Vulnerability
Wi-Fi Secrity White Paper
Wi-Fi_Protected_Access_Overview
Making the Most from WEP
802.11 Security Beyond WEP
Why is WEP crackable?
WPA vs WEP: Why is WPA better than WEP?
WPA versus 802.11i (WPA2)
WPA Security Enhancements
WPA2 FAQ