In classical web applications, when we submit a form, although most of the page remains the same, whole page is reloaded from the server. This causes long waiting times and waste of bandwidth. The combination of a group of web technologies known as AJAX is come up with to create interactive web applications. With AJAX, web applications can retrieve data asynchronously from server while not refreshing the whole page.
AJAX is a shorthand for asynchronous JavaScript and XML. AJAX is not a technology in itself, but a term that refers to the use of a group of technologies together.
