Using these terms interchangeably is a pet-hate of Sir Tim-Bernes-Lee, who invented the WWW and works at our university, so it seemed an appriate choice! The internet can be thought of as a massive network (or network of networks). A device within this network is said to be "on the internet". The internet is also a collection of protocols for discovering devices and for placing data "on-the-wire" (that is, sending it between netwrked-devices). The WWW, on the other hand, is an application of the internet. In other words, it is something which makes use of the internet to provide functionality. The WWW is a collection of protocols and standards for sharing information (mainly documents) between internet-networked devices. One such standard you have probably heard of is HTML. This is the standard used to specify web-page content. If you right-click in most browsers, you can select "see source" or "inspect" to see the HTML behind the site.