Finally found something that simply explains the core of what AJAX is, and the basic benefits it delivers. For more detail see the link but this is my copy and past overview. I really want to get my teeth into interaction design using this type of technology…. Death to the page !!!!!!
The classic web application model works like this: Most user actions in the interface trigger an HTTP request back to a web server. The server does some processing — retrieving data, crunching numbers, talking to various legacy systems — and then returns an HTML page to the client.
How Ajax is Different
An Ajax application eliminates the start-stop-start-stop nature of interaction on the Web by introducing an intermediary — an Ajax engine — between the user and the server. It seems like adding a layer to the application would make it less responsive, but the opposite is true.