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AJAX - Asynchronous JavaScript and XML

AJAX tutorial

AJAX is a developer's dream, because you can: 
Update a web page without reloading the page
Request data from a server - after the page has loaded
Receive data from a server - after the page has loaded
Send data to a server - in the background

What is AJAX?

AJAX = Asynchronous JavaScript And XML. 
AJAX is not a programming language. 
AJAX just uses a combination of: 
A browser built-in XMLHttpRequest object (to request data from a web server) JavaScript and HTML DOM (to display or use the data) 
AJAX applications might use XML, plain text or JSON text to transport data.

AJAX allows web pages to be updated asynchronously by exchanging data with a web server behind the scenes. This means that it is possible to update parts of a web page, without reloading the whole page.

How ajax works

1. An event occurs in a web page (the page is loaded, a button is clicked)
2. An XMLHttpRequest object is created by JavaScript
3. The XMLHttpRequest object sends a request to a web server
4. The server processes the request
5. The server sends a response back to the web page
6. The response is read by JavaScript
7. Proper action (like page update) is performed by JavaScript

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