<P> Web 2.0 refers to World Wide Web websites that emphasize user - generated content, usability (ease of use, even by non-experts), and interoperability (this means that a website can work well with other products, systems, and devices) for end users . The term was popularized by Tim O'Reilly and Dale Dougherty at the O'Reilly Media Web 2.0 Conference in late 2004, though it was coined by Darcy DiNucci in 1999 . Web 2.0 does not refer to an update to any technical specification, but to changes in the way Web pages are designed and used . </P> <P> A Web 2.0 website may allow users to interact and collaborate with each other in a social media dialogue as creators of user - generated content in a virtual community, in contrast to the first generation of Web 1.0 - era websites where people were limited to the passive viewing of content . Examples of Web 2.0 features include social networking sites and social media sites (e.g., Facebook), blogs, wikis, folksonomies ("tagging" keywords on websites and links), video sharing sites (e.g., YouTube), hosted services, Web applications ("apps"), collaborative consumption platforms, and mashup applications . </P>

What are the features of web 2.0 technologies
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