The semantic web is primarily focused on machines. While Web 2.0 is mainly operated and controlled by a human being, the semantic web is controlled and operated by machines. These computer systems perform the tasks that find and search information. It is presented in a way that a computer can understand what is going on. The semantic web is not separate from the World Wide Web. Rather, it is an extension of it, by that it adds data and metadata to other existing Web page documents. Not a lot of companies and peoples use the semantic web yet. Twine is one company that uses Semantic Web technologies, as well as Joost, an online television service. Semantic Web uses the RDF (Resource Description Framework) to change Web data so that software can easily read it. So semantic web does have advantages, because people might need something for computers to translate for them, and the semantic web is the easiest way to do that.
More information about semantic web can be read at:
http://www.webopedia.com/DidYouKnow/Internet/2007/Semantic_Web.asp
