A web page URL is a file name, just like filename.jpg, filename.doc, or, as in the case of a web page, filename.html. The page URL is the part that comes after the domain, such as 'domain.com/page-url.' In some cases, there might be a subfolder preceding the Page URL, like 'domain.com/sub-folder/page-url.' The combination of the subfolder and Page URL forms the complete page name.