万维网

定义： 是一个由许多互相链接的超文本组成的系统，通过互联网访问。

          (The World Wide Web (www) is an open source information space where documents and other web resources are identified by URLs, interlinked by hypertext links, and can be accessed via the Internet.^[1] It has become known simply as the Web)

关键词： 资源（resource)  

            统一资源标识符（url  uniform resource identifier) ，用以标识

            超文本链接，用以互链

            hypertext : Hypertext is text displayed on a computer display or other electronic devices with references (hyperlinks) to other text which the reader can immediately access, or where text can be revealed progressively at multiple levels of detail (also called StretchText).^[1] The hypertext pages are interconnected by hyperlinks, typically activated by a mouse click, keypress sequence or by touching the screen. Apart from text, hypertext is sometimes used to describe tables, images and other presentational content forms with hyperlinks

发明人：蒂姆·伯纳斯-李(Tim Berners-Lee)

区别： 万维网并不等同互联网，万维网只是互联网所能提供的服务其中之一，是靠着互联网运行的一项服务

         万维网是一个distributed system, 所有一切看起来就像是一个文档一样。