What is AJAX?

AJAX = asynchronous JavaScript and XML.

AJAX is a method for creating a fast dynamic webpage technology.

Through a few data exchange in the background and the server, AJAX can realize the asynchronous update the webpage. This means you can without reloading the whole webpage circumstances, to update a webpage.

Traditional webpage (no AJAX ) if you need to update the content, essential to reload the whole webpage surface.

There are a lot of applications using AJAX case: Sina micro-blog, Google map, happy net etc..