Techniques for asynchronous server communication have been around for years. What makes ajax a "new" approach?
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Answer / Sunita Garbyal
While asynchronous server communication is not new, AJAX made it easier and more accessible to web developers by combining several existing technologies (XHTML, CSS, JavaScript, and XMLHttpRequest) in a simple and cohesive way. Before AJAX, developers had to rely on various techniques such as iframes or meta refreshes for asynchronous communication, which were less efficient and more complex.
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