what is the differents of alpha and beta?
 

I like to know their is beta1,beta2... and their is alpha1,alpha2...so what is the different?

Tnx schneemann

Well, just like in the Greek alphabet, alpha is earlier than beta. They're both used for testing releases, with alpha versions indicating very early test releases, while beta versions being the middle testing release. Beta versions are often followed by rc (release candidate) versions, which are the final testing stage.