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# What is AJAX ?

- AJAX stands for Asynchronous JavaScript and XML. AJAX is a new technique for creating better, faster, and more interactive web applications with the help of XML, HTML, CSS and Java Script.

- Ajax uses XHTML for content and CSS for presentation, as well as the Document Object Model and JavaScript for dynamic content display.

- Conventional web application trasmit information to and from the sever using synchronous requests. This means you fill out a form, hit submit, and get directed to a new page with new information from the server.

- With AJAX when submit is pressed, JavaScript will make a request to the server, interpret the results and update the current screen. In the purest sense, the user would never know that anything was even transmitted to the server.

- XML is commonly used as the format for receiving server data, although any format, including plain text, can be used.

- AJAX is a web browser technology independent of web server software.

- A user can continue to use the application while the client program requests information from the server in the background

- Intuitive and natural user interaction. No clicking required only Mouse movement is a sufficient event trigger.

- Data-driven as opposed to page-driven

## Rich Internet Application (RIA) Technology

AJAX is most viable RIA technology so far. Its getting tremendous industry momentum and several toolkit and framworks areemerging. But same time JAX has browser incompatibility and it is supported by Java Script which is hard to maintain nand debug.

## AJAX Is Based On Open Standards

AJAX is based on the following open standards:

- Browser-based presentation using HTML and Cascading Style Sheets (CSS)
- Data stored in XML format and fetched from the server
- Behind-the-scenes data fetches using XMLHttpRequest objects in the browser
- JavaScript to make everything happen

## AJAX - Recommended Knowledge

It is highly recommended that you are familiar with HTML and Javascript before attempting this tutorial.

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