Just as you start getting comfortable with the Next Big Thing, along comes the next Next Big Thing. It's an endless loop. I've linked a number of articles that explain the technology in depth.
Designers can create richer layouts and stronger interactivity features.
With the ability to use document object models, users and Webmasters can manipulate objects on a Web page independently of one another. Illusion of Speed. More information can be transmitted with the original Web page, freeing up overburdened Web servers and giving the user the illusion of speedier access. It all sounds so appealing. At least on the surface.