AJAX is a complex phenomenon that means different things to different people.
Computer users appreciate that their favorite websites are now friendlier and feel
more responsive. Web developers learn new skills that empower them to create sleek
web applications with little effort. Indeed, everything sounds good about AJAX!
At its roots, AJAX is a mix of technologies that lets you get rid of the evil page
reload, which represents the dead time when navigating from one page to another.
Eliminating page reloads is just one step away from enabling more complex features
into websites, such as real-time data validation, drag-and-drop, and other tasks
that weren't traditionally associated with web applications. Although the AJAX
ingredients are mature (the XMLHttpRequest object, which is the heart of AJAX,
was created by Microsoft in 1999), their new role in the new wave of web trends is
very young, and we'll witness a number of changes before these technologies will be
properly used to the best benefit of the end users.

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