The difference between Web 1.0 and Web 2.0 is
that with Web 2.0 you use the Internet and
communicate through it. The Web 1.0 was very straight. The Internet was seen
for business. Webmaster's created websites and users visited and just
viewed them. Communication was between Webmaster and client only. Webpages were
static, when you needed any information the only thing you could do was to “Ask
Jeeves” or “Yahoo”, now we can “Google it”, “Bing it” or ask questions of
other users in forums.

Refrences:http://en.wikipedia.org/wiki/Web_2.0,http://www.web2expo.com/, http://oreilly.com/web2/ and http://wittycookie.wordpress.com/2012/06/04/what-are-the-major-differences-among-web-1-0-2-0-and-3-0/