Well, for starters, you're looking at these pages via the World Wide Web.
Remember back at the description of what the Internet is? Remember that the Internet is made up of thousands of computers linked together. Information is passed from computer to computer until it reaches it's destination. The World Wide Web is kind of like that, except the reverse applies. On the World Wide Web, you go from piece of information to piece of information until you get to the information that you want.
The World Wide Web is made up of static (unchanging) web 'pages', like this one. You can 'go to' that web page and read it instantly, on any computer. You read through that information on that web page, and then you can click on a link to go to another web page. So after an hour, you've clicked from page to page to page to wind up on a completely different, web page. Pages can be linked together, cross-linked, and linked again. If you were to map out the World Wide Web, it would indeed look like a very large spider web, hence it's name.