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the sources from wikipedia, the free encyclopedia
WEB 2.0
The term "Web 2.0" (2004–present) is commonly associated with web applications that facilitate interactive information sharing, interoperability, user-centered design, and collaboration on the World Wide Web. Examples of Web 2.0 include web-based communities, hosted services, web applications, social-networking sites, video-sharing sites, wikis, blogs, mashups, and folksonomies. A Web 2.0 site allows its users to interact with other users or to change website content, in contrast to non-interactive websites where users are limited to the passive viewing of information that is provided to them.

sources http://en.wikipedia.org/wiki/Web_2.0


Characteristics

-allows its users to upload and share photos
-allow users to do more than just retrieve information
-can build on the interactive facilities of "Web 1.0" to provide "Network as platform" computing
-allowing users to run software-applications entirely through a browser
-Users can own the data on a Web 2.0 site and exercise control over that data
-encourages users to add value to the application as they use it

WEB 1.0
Web 1.0 (1991-2003) is a retronym which refers to the state of the World Wide Web, and any website design style used before the advent of the Web 2.0 phenomenon. Web 1.0 began with the release of the WWW to the public in 1991, and is the general term that has been created to describe the Web before the "bursting of the Dot-com bubble" in 2001, which is seen by many as a turning point for the internet.
Since 2004, Web 2.0 has been the term used to describe the current age of the Internet.
It is easiest to formulate a sense of the term Web 1.0 when it is used in relation to the term Web 2.0, to compare the two and offer examples of each.
http://en.wikipedia.org/wiki/Web_1.0

the differences between Web 1.0 and Web 2.0:

-Web 1.0 was about reading, Web 2.0 is about writing
-Web 1.0 was about companies, Web 2.0 is about communities

-Web 1.0 was about client-server, Web 2.0 is about peer to peer

-Web 1.0 was about HTML, Web 2.0 is about XML
-Web 1.0 was about home pages, Web 2.0 is about blogs
-Web 1.0 was about lectures, Web 2.0 is about conversation
-Web 1.0 was about advertising, Web 2.0 is about word of mouth
-Web 1.0 was about services sold over the web, Web 2.0 is about web services
-Web 1.0 was dial-up, 50K average bandwidth, Web 2.0 is an average 1 megabit of bandwidth.
http://www.darrenbarefoot.com/archives/2006/05/web-10-vs-web-20.html