The Semantic Web is not a separate entity from the World Wide Web. It is an extension to the Web that adds new data and metadata to existing Web documents, extending those documents into data. This extension of Web documents to data is what will enable the Web to be processed automatically by machines and also manually by humans. To do this RDF (Resource Description Framework) is used to turn basic Web data into structured data that software can make use of. RDF works on Web pages and also inside applications and databases.