What is Adobe Flex?15 Nov 2006
Adobe Flex is an IDE for building web applications and rich internet applications.
Nah, I don't say that. I learnt this from Google search result as shown below.
I think, Adobe Flex is set of technologies (Framework, SDK, IDE, FDS etc) that together (or individually) allows you to create Rich Internet Application and more for Adobe Flash Platform.
Hope, Adobe web-team (JD?) is reading this post and correct the meta-description.