The Internet is basically a bunch of computers linked together through a network so computer users in different locations can have access to the same information.
Web pages are files stored on computers located all over the world.
The internet is a client-server system. Your computer is the client, and the computer which stores the data is the server. When you click onto a website, your computer requests the web page from the specific server storing that file. That server sends the data file you've requested over the internet to your computer. Your web browser interprets the data and displays it on your computer screen.