refer to the website for all 68 tutorials; i only selected a few to clip

what is web 2.0?

Web 2.0, a phrase coined by O'Reilly Media in 2004,[1] refers to a perceived or proposed second generation of Web-based services—such as social networking sites, wikis, communication tools, and folksonomies—that emphasize online collaboration and sharing among users. O'Reilly Media, in collaboration with MediaLive International, used the phrase as a title for a series of conferences, and since 2004 some developers and marketers have adopted the catch-phrase. Its exact meaning remains open to debate, and some technology experts, notably Tim Berners-Lee[2], have questioned the meaning of the term.