What is AJAX.

AJAX:

AJAX stands for Asynchronous JavaScript and XML.
AJAX is a way to exchange data with a server using JavaScript;
this allows updating parts of a web page instead of reloading a whole new page.
Example applications using AJAX includes Google Maps, Gmail, Google Docs.

History:

In 1999, XMLHttpRequest was introduced in IE and other browsers.
In 2005, Jesse James Garrett coined the term “AJAX” to describe how the following technologies are incorporated using JavaScript.

• HTML and CSS for the structure and presentation
• The Document Object Model (DOM) for dynamic changes
• XML (and JSON) for the data exchange
• The XMLHttpRequest object for asynchronous communication