The semantic web explained
I just found a nice, clear and above all short explanation of the Semantic Web at The W3C’s Technology & Society Domain page:
The Semantic Web seeks to augment the current Web of linked documents with a Web of linked data. Today, Web users follow links from document to document in a largely manual process. Tomorrow, semantically-enabled links will enable both human users, and human users assisted by computers, to navigated these links and find the information they are looking for. [...] To reach its full potential, the Web must becomes a place where data can be shared and processed by automated tools as well as by people.