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Web 2.0 offers all users the same freedom to contribute.

While this opens the possibility for serious debate and collaboration,

Web 2.0 are: rich user experience, user participation,dynamic content, metadata, Web standards, and Scalability;

Further characteristics, such as openness, freedom  and collective intelligence  by way of user participation, can also be viewed as essential attributes of Web 2.0.
In 2004, the term began its rise in popularity when O'Reilly Media and MediaLive hosted the first Web 2.0 conference. In their opening remarks, John Battelle and Tim O'Reilly outlined their definition of the "Web as Platform", where software applications are built upon the Web as opposed to upon the desktop. The unique aspect of this migration, they argued, is that "customers are building your business for you".


 They argued that the activities of users generating content (in the form of ideas, text, videos, or pictures) could be "harnessed" to create value. O'Reilly and Battelle contrasted Web 2.0 with what they called "Web 1.0". They associated this term with the business models of Netscapeand the Encyclopædia Britannica Online

required to send data back to the client.

The data fetched by an Ajax request is typically formatted in XML or JSON (JavaScript Object Notation) format, two widely used structured data formats. Since both of these formats are natively understood by JavaScript, a programmer can easily use them to transmit structured data in their Web application. When this data is received via Ajax, the JavaScript program then uses the Document Object Model (DOM) to dynamically update the Web page based on the new data, allowing for a rapid and interactive user experience. In short, using these techniques, Web designers can make their pages function like desktop applications. For example, Google Docs uses this technique to create a Web-based word processor

 
 
 

Some design elements of a Web 1.0 site include:



  • The use of HTML 3.2-era elements such as frames and tables to position and align elements on a page. These were often used in combination with spacer GIFs. 




  • HTML forms sent via email. Support for server side scripting was rare on shared servers during this period. To provide a feedback mechanism for web site visitors, mailto forms were used. 


  • A user would fill in a form, and upon clicking the form's submit button, their email client would launch and attempt to send an email containing the form's details. 


  • The popularity and complications of the mailto protocol led browser developers to incorporate email clients into their browsers...

Mainstream media usage of Web 2.0 is increasing. Saturating media hubs—like The New York Times, PC Magazine and Business Week — with links to popular new Web sites and services, is critical to achieving the threshold for mass adoption of those services.  

User web content can be used to gauge consumer satisfaction. In a recent article for Bank Technology News, Shane Kite describes how Citigroup's Global Transaction Services unit monitorssocial media outlets to address customer issues and improve products. 

According to Google Timeline, the term Web 2.0 was discussed and indexed most frequently in 2005, 2007 and 2008. Its average use is continuously declining by 2–4% per quarter since April 2008

 

The popularity of Web 2.0 was acknowledged by 2006 TIME magazine Person of The Year (You).


That is, TIME selected the masses of users who were participating in content creation on social networks, blogs, wikis, and media sharing sites. In the cover story, Lev Grossman explains:

It's a story about community and collaboration on a scale never seen before. It's about the cosmic compendium of knowledge Wikipedia and the million-channel people's network YouTube and the online metropolis MySpace. It's about the many wresting power from the few and helping one another for nothing and how that will not only change the world but also change the way the world changes