Web 2.0 is more of a buzzword really. Just something O'Reilly started in the late 90's. In what was ment then it is just a word for the changes on the internet. Examples today can be:

DoubleClick was Web 1.0;
Google AdSense is Web 2.0.

Ofoto is Web 1.0;
Flickr is Web 2.0


Since Web 2.0 is a lose term they more or less define a web 2.0 page today a page that uses "new" standards like:

* CSS, semantically valid XHTML markup, and Microformats
* Unobtrusive rich application techniques (such as Ajax)
* XUL
* SVG
* Flash Remoting
* Syndication of data in RSS/Atom
* Aggregation of RSS/Atom data
* Clean and meaningful URLs
* Weblog publishing
* REST or XML Webservice APIs
* Some social networking aspects

which is both technologies and just paradigms. Also notice that IE doesn't support all of these technologies....just had to say it once more..


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