World Wide Web is the vast amount of computers, that are acting as web servers, which use the protocol HTTP to transfer documents to a user's computer to be viewed with a web browser. The documents that are transfered to the user's computer are called HTML documents. These documents contain information that tell the user's web browser how to show images, text, video, or sound. They also contain links to other HTML pages, whether these pages are on the same web server or on another one.