AJAX (Asynchronous JavaScript + XML) is a rapidly emerging programming technique that attracts lots of attention nowadays. The improved interactivity of AJAX-powered interfaces bridges the traditional gap between Desktop and Web applications. Ability to mash-up services or functionality in a rich client allows building powerful new or improving existing web software. Well-applied AJAX is a definite advantage for any kind of web application – from simple sites to complex and sophisticated business applications.
Rich web interfaces add more value to next-generation enterprise applications designed on the progressive Services Oriented Architecture (SOA). AJAX is the advanced interface technology providing extended visual service, desktop interactivity and functionality. It adds value to SOA through better user interaction with both remote (internet, extranet) and local (intranet) enterprise applications. Adding RIA (Rich Internet Application) to existing enterprise IT infrastructure presents several benefits including operation cost savings, better control over document circulation and improved security.
What is AJAX?
Ajax isn't a technology. It's really several technologies, each flourishing in its own right, coming together in powerful new ways.
Asynchronous : This is the key. In standard Web applications, the interaction between the customer and the server is synchronous. This means that one has to happen after the other. If a customer clicks a link, the request is sent to the server, which then sends the results back.
With Ajax, the JavaScript that is loaded when the page loads handles most of the basic tasks such as data validation and manipulation, as well as display rendering the Ajax engine handles without a trip to the server. At the same time that it is making display changes for the customer, it is sending data back and forth to the server. But the data transfer is not dependent upon actions of the customer.

Benefits of AJAX technology
Time Saving
Saves server overheads
Better usability
Cross-Browser and Cross-Platform compatibility
Incremental skills, tools and technologies upgrade
Compatible with any web server and scripting language
AJAX Frameworks and Related Technologies
AI specialists use different AJAX frameworks that let focus on application’s unique aspects by streamlining routing tasks. This helps increase developers’ productivity and accelerate development cycles.
jQuery
ExtJS
Prototype.js
ASP.NET AJAX (former ATLAS)
R.A.D. AJAX
Yahoo UI
Cpaint
Rico
We have good experience with various AJAX related technologies including:
XHTML and CSS
Document Object Model
XML / XSLT / Xpath
XForms
JavaScript
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