The evolution of designing a web has evolved. From the more complex to simple and clean. That’s what I described about what Web 2.0 is. As we all know most of the websites uses this design approach.
Definition
As Tim O’Reilly define.
Web 2.0 technology encourages lightweight business models enabled by syndication of content and of service and by ease of picking-up by early adopters.
O’Reilly provided examples of companies or products that embody these principles in his description of his four levels in the hierarchy of Web 2.0-ness:
- Level-3 applications, the most "Web 2.0"-oriented, only exist on the Internet, deriving their effectiveness from the inter-human connections and from the network effects that Web 2.0 makes possible, and growing in effectiveness in proportion as people make more use of them. O’Reilly gave as examples eBay, Craigslist, Wikipedia, del.icio.us, Skype, dodgeball, and AdSense.
- Level-2 applications can operate offline but gain advantages from going online. O’Reilly cited Flickr, which benefits from its shared photo-database and from its community-generated tag database.
- Level-1 applications operate offline but gain features online. O’Reilly pointed to Writely (now Google Docs & Spreadsheets) and iTunes (because of its music-store portion).
- Level-0 applications work as well offline as online. O’Reilly gave the examples of MapQuest, Yahoo! Local, and Google Maps (mapping-applications using contributions from users to advantage could rank as "level 2").
Non-web applications like email, instant-messaging clients, and the telephone fall outside the above hierarchy.
Characteristics
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. Users can own the data on a Web 2.0 site and exercise control over that data. These sites may have an "Architecture of participation" that encourages users to add value to the application as they use it. This stands in contrast to very old traditional websites, the sort which limited visitors to viewing and whose content only the site’s owner could modify. Web 2.0 sites often feature a rich, user-friendly interface based on Ajax,openlaszlo, Flex or similar rich media. The sites may also have social-networking aspects.
The concept of Web-as-participation-platform captures many of these characteristics. Bart Decrem, a founder and former CEO of Flock, calls Web 2.0 the "participatory Web"and regards the Web-as-information-source as Web 1.0.
The impossibility of excluding group-members who don’t contribute to the provision of goods from sharing profits gives rise to the possibility that rational members will prefer to withhold their contribution of effort and free-ride on the contribution of others.
According to Best, the characteristics of Web 2.0 are: rich user experience, user participation, dynamic content, metadata, web standards and scalability. Three further characteristics that Best did not mention about web 2.0: openness, freedom and collective intelligence by way of user participation – all should be viewed as essential attributes of Web 2.0.
So u have the overview on what Web 2.0 is. As for my own definition it is, accesible, fast loading, eye cooler, clean, organized, simplicity but not sacrificing quality.
Some of the top web 2.0 design websites which u may view to familiarize what i mean is in CSSMania.
Here are my Web 2.0 Web Sample. (It’s just a sample)

