JavaScript and AJAX
JavaScript is a scripting language whose syntax is loosely based on C. It's most popular application is for writing functions or scripts that can be embedded in HTML pages to perform tasks not achievable in HTML alone. JavaScript has made a popular comeback in recent years thanks to the Web 2.0 concept of AJAX.
AJAX is an acronym of several slightly different phrases but the most common of these is Asynchronous JavaScript and XML. It is a technique (not a technology) to make web applications feel more like traditional desktop applications by not requiring the page to "reload" every time a task is performed.
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