How to Create a Website - Create-Website.org
If you construct a website on a personal computer, you will need to publish it to a web server for it to be visible on the world wide web.
Some HTML generators and website construction applications have built-in functionality to copy the website content to a server computer, however some don't.
FTP is a "file transfer protocol" that can be used to transfer files from one computer to another. There are many different FTP packages available. Most provide a user interface that lists the files on both computers and on the server. It allows the user to transfer individual files or entire websites between the personal computer and the server computer.