The principles architecture of standards, languages and formalisms that provides a platform for many heterogeneous applications same meaning and purpose of the web.

Many people create documents, but pre-Web the assumption was that a document was the private property of its creator, and decision to publish was his or hers alone.

Furthermore, the technology to allow people to publish and disseminate documents cheaply and easily was lacking, The Web’s aim was to alter that behavior radically and provide the technology to do it.

The Semantic web is an attempt to extend the potency of the web with an analogous extension of people’s beahaviour. And the semantic web is an extension of the WWW in terms of its being the next stage of linking –linkingdata not documents, so Linking is the key of the semantic Web.

The Web is engineering from php, HTML, XML and other language , its linking with the database to connect with the saving information that using SQL language and then web can be the social network, multi media, and more bussines with it.