As web2.0 coming to the end , a general question is what is next. I have queried google got that there is web3 and web4. Let discuss about web3.0.

Most of the Technolgy experts thinks that Web 3.0 is a friendly person who will behave like he knows about you and can understand what you want. They also teling that the period 2010 to 2020 will be the web3.0 era.

They are giving a clue that Web 3.0 is a giant database. The major differece with Web 2.0 is it uses the Internet to make connections between people, Web 3.0 will use the Internet to make connections with information.

Some experts see Web 3.0 replacing the current Web while others believe it will exist as a separate network.

so come to what web 3.0 actulay is
Here comes the term "Semantic Web"

"In its current state, the Web is often described as being in the Lego phase, with all of its different parts capable of connecting to one another. Those who envision the next phase, Web 3.0, see it as an era when machines will start to do seemingly intelligent things." - John Markoff, The New York Times

With the Semantic Web, computers will scan and interpret information on Web pages using software agents. These software agents will be programs that crawl through the Web, searching for relevant information. They'll be able to do that because the Semantic Web will have collections of information called ontologies.