The term Web 2.0, or "Web Two", is considered to
refer to the social interactive nature of the world wide web.
The phrase emerged and gained acceptance around 2005, but it's true meaning
probably wasn't completely understood until the advent of highly popular social
Video and picture sharing is also another typical example of what may be
considered as a Web 2.0 concept.
Web 2.0 was also thought to mean to encompass an interactive web through
actions such as commenting on news stories and video sharing sites.
Other forms of Web2.0 are blogs, forums and wikis, just about any site that
has interaction like this are generally put into the mix of Web2.0 concepts.
From a style point a view, Web 2.0 graphics generally can include rounded edges
and gradient colors amongst others, but have evolved over the years.