Publication is the process of copying one of your SiteXpress websites (if you have built more than one) into the web root directory of your domain. Once there, the website will be live on the Internet, accessible by entering your domain name into the location bar of a web browser.
You can also publish an individual page, assuming you have only made content item changes to that page (as opposed to changes that affect site structure).
Note: The total diskspace of your published website may not exceed 15MB.