Before you can read a book, you need to pick it up. Similarly, before you can read a web page, you have to fetch it from the Internet. So, how do we go about fetching a web page to read? Well, guess what? It's just like the real world.
Suppose you want to read The Hobbit. You might do something like this:
Now, suppose you want to read a web page, for example: http://www.gondolin.org.uk/index.html
Copying web pages to your computer usually uses a standard known as the HyperText Transfer Protocol, or HTTP. This is why most web addresses begin with "http://" (or "https://" - the secure (encrypted) version of HTTP) - that tells your computer how it should talk to the server (a bit like knowing what language to speak when you talk to the librarian in the library example.)