The Web and the Internet are often used interchangeably, even though they are not quite the exact thing. The Internet is a world wide network of computers. The Web is a way of presenting information on the Internet.
Information shows on 'pages'.
The size of a page can be large or small - they expand or contract to fit the information they contain. Pages can also inclued moves, animation,s sounds, music, links to other pages, etc. A group of pages is referred to as a 'Web Site'. The main page is called the index page or 'homepage'. This Web Site and all the information they may contain are stored on network computers called 'Servers' or 'Hosts'.