AJAX is a series of interrelated technologies that power the so-called Web 2.0:
Asynchronous communications with the web server
Javascript
XML
What Do These Buzzwords Mean?
Asynchronous refers to the method in which the web browser communicates with the server. Rather than rely upon the actions of the user – “click,” then send data to server, then wait for the server to send a response back, then refresh the screen – the AJAX “engine” manages the process




