Web 1.0 created web pages for a large number of readers. people could get information by going directly to the origin, for example Microsoft.com for windows issues. although, over time, more and more people starting writing content, as well as reading it. unexpectedly, there was too much information to keep up with. as personal publishing caught on and became common, it was evident that Web 1.0 had to change.

This was then where Web 2.0 was made. Information was now broken up into 'microcontent' content that can be now be delivered over dozens of domains. Documents on the web have now altered into data on the web. We are no longer just looking to the same old sources for information. Now we’re looking to a new set of tools to aggregate and remix microcontent in new and useful ways.

Web 2.0 websites allow users to do more than just retrieve information. They can build on the interactive facilities of Web 1.0 to provide Network as platform computing, allowing users to run software-applications entirely through a browser.

Some examples of Web 2.0 can work online but also feature advantages of working online. Examples of these include:


Map Quests
Gmail
Google Earth
iTunes
Google Maps

However, there are some Web 2.0 examples that exist only on the internet, relying on inter-human interaction. These sites grow more and more as people have more use of them:

Ebay
Wikipedia
Skype

References:

O'Reilly, Tim. "What is Web 2.0?" 11 March 2009
http://www.oreillynet.com/pub/a/oreilly/tim/news/2005/09/30/what-is-web-20.html

MacManus, Richard. Porter, Joshua. "Web 2.0 for Designers" Digital Wed Magazine.11 March 2009
http://www.digital-web.com/articles/web_2_for_designers/