You’ve decided Google Apps is right for you—congratulations! But you can’t just start using Google Apps in the same way that you can’t just start using Microsoft Office. If you tell me that you want to use Office, my first question is, “What version of Office is appropriate for you?” (For many people, the answer is “None.”) Microsoft has decided, for various reasons—some good, some silly, mostly incomprehensible—to create and market different versions of Office with different features and for different audiences. Likewise, before you register and start using Google Apps, you have to choose between what Google calls its “editions” of Apps.
Currently, Google has five editions available: