All web pages on the internet are stored on a Web Server somewhere, you must have a designated location that the page will be stored so that it is viewable on the internet.
What Are Computers That Store Web Pages Called?
Depending on the web page (personal, corporate and so on) they are usually stored on servers, programs like Dreamweaver can upload website made by yourself and are stored on your computer, once uploaded I believe they become store on the internet itself.