This is the main page of a web site and is usually the "index.html" page of a web site. When a browser is searching for the first page of a web site such as Google it looks for the "index.html" page. This page is usually the home page of a web site and usually includes links and information to all the sections of a web sites. You will also usually find a link back to the home page of a web site from all the subsections of a web site.