Remember that web pages are usually used as a means of conveying data, or information. The data is your message. This is the meat of the HTML document. Text and content are most important. Once you have created a web page, you store it on a certain type of computer called a web server.
Web servers are computers which are attached to the Internet, and do basically two things.
A web server stores information documents and sends those documents to any other computer which requests them. The first thing the browser wants to know is where to go. You type in an url. An url is an address. This address tells the browser exactly where to find the page you're looking for.