Application development platforms and frameworks

With rapid application development platforms coming to surface along with application development frameworks, it is geting difficult to isolate platforms from frameworks.

Platforms and frameworks share some common technical solution components yet they are different. The main diference that I think and I may be 100% wrong, is that frameworks are developed on specific platforms say for example application development framework are developed on O/s platforms. And then product versioning goes on after launch to make the framewoks platform independent. Whereas platforms are developed not keeping in mind to support any spefic application development frameworks but to be an interface with the computer and its various applications. I mean, I think so, conceptualy at least.

I will appreciate if any one could educate me with examples.

thanx