When a visitor types in the URL of your site, www.example.com (or when they navigate from another site), the Home Page is usually the first page they visit. The Home Page itself is the first published page located in the mainmenu section of the Menu Manager.
The Home Page is the equivalent to an index page in a static HTML web site. In Mambo terms, your Home Page is the same as your Front Page.
You can set any content item as the Home Page/ Front Page of your Mambo site. All you need to do is create a content item and link to it from the first menu item at the top of the mainmenu.
Even if the mainmenu Module is NOT published, your Home page will still display the Menu Item that is set as the top of the mainmenu list of items.