USA Today

You can’t easily point to a piece of software or the way a Web page is designed and say “This is part of Web 2.0.” The effect is cumulative. In fact, there isn’t even agreement on what the term “Web 2.0″ means. For some, it’s about a new generation of websites that use a set of technology called AJAX (asynchronous JavaScript and XML) that allow them to offer applications — word processors, spreadsheets, and more — that work as smoothly and quickly as software on your hard drive. (Check out Writely.com for an excellent example.)

Others see it as a collection of sites and pages with well-labeled content (sometimes called “the Semantic Web”), so that information on one site is understandable to other sites. For example, if content on my page were labeled as breaking news on a particular subject, other sites that aggregate news content would know to grab it.

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