Please someone help clarify things for me

As far as adobe products go there is Flash, Flex and Air. Now this is where things go bad for me. And I was at Adobes site trying to understand the flow.

What is the use for each and can you develop stuff for each in any of the above environments? Like Flex apps in Flash. AIR apps using flex. I just do not understand the tie in or break off points for each. If you use flash to build a flex app. At which point is it no longer a flash app?

Adobes site isnt much help. I guess unless you start taking all the tuts.