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Ajax, or AJAX (Asynchronous JavaScript and XML), is a group of interrelated web development techniques used to create interactive web applications or rich Internet applications. With Ajax, web applications can retrieve data from the server asynchronously in the background without interfering with the display and behavior of the existing page. The use of Ajax has led to an increase in interactive animation on web pages. Data is retrieved using the XMLHttpRequest object or through the use of Remote Scripting in browsers that do not support it. Despite the name, the use of JavaScript and XML is not actually required, nor do the requests need to be asynchronous.

AJAX = Asynchronous JavaScript and XML AJAX is not a new programming language, but  a technique for creating better, faster, and more interactive web  applications.
With AJAX, your JavaScript can communicate directly with the server, using the  JavaScript XMLHttpRequest object. With this object, your JavaScript can  trade data with a web server, without reloading the page.
AJAX uses asynchronous data  transfer (HTTP requests) between the browser and the web server, allowing web pages to request  small bits of information from the server instead of whole pages.
The AJAX technique makes Internet applications smaller, faster and more user-friendly.
AJAX  is a browser technology independent of web server software.

AJAX is based on the following web standards:

• JavaScript
  
• XML
  
• HTML
  
• CSS