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Asynchronous JavaScript and XML (AJAX) is a bundling/simplification of technology that has existed for a while. It is a framework for building interactive Web applications that work across the popular browsers. It auto generates the necessary client-side scripting to provide a more robust user experience than native ASP.NET alone. ASP.NET AJAX originated as a separate download for ASP.NET 2.0 and Visual Studio 2005. It is now built into ASP.NET 3.5 and Visual Studio 2008.