Ajax short for Asynchronous Javascript + XML is technology for developing web applications which was used years before it was coined by Jesse James Garrett in February 2005. This was overlooked by web developers until Gmail and Google used it in its applications such as Google Map and Google Suggest. Check the details in http://www.itexpertscentral.com/tabid/70/articleType/ArticleView/articleId/4/Overview-of-AJAX.aspx
