Web 2.0

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Web 2.0 is term that was introduced in 2004 and refers to the second generation of the World Wide Web. The term 2.0 comes from the software industry, where new versions of software programs are labeled with an incremental version number. Like software, the new generation of the Web includes new features and functionality that was not available in the past. However, Web 2.0 does not refer to a specific version of the Web, but rather a series of technological improvements.
Some examples of features considered to be part of Web 2.0 are listed below:
Web 2.0 technologies provide a level user interaction that was not available before. Websites have become much more dynamic and interconnected, producing online communities and making it even easier to share information on the Web. Because most Web 2.0 features are offered as free services, sites like Wikipedia and Facebook have grown at amazingly fast rates. As the sites continue to grow, more features are added, building off the technologies in place. So, while Web 2.0 may be a static label given to the new era of the Web, the actual technology continues to evolve and change.