Ajax allows web pages to asynchronously update parts of a page by exchanging data with a web server behind the scenes, without reloading the entire page. It uses a combination of technologies including HTML, JavaScript, CSS, and XML/XHTML to retrieve data from the server and update parts of the page. This allows pages to load faster and provides a more responsive interface compared to full page reloads.

3. WORKING PRINCIPLE OF AJAX

6. SENDING METHODS AND THIER FUNCTIONS

12. AJAX REQUEST Ajax sends a request to the server with following some method, the methods are “open()” and “send()”, the open method uses three augments, first is method type, second is defined the url of the server side script and the third one is specifies that the request should be handled asynchronously and the send method is sends the request off to the server.