Web 2.0 describes World Wide Web websites that emphasize user-generated content, usability and interoperability 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.