On any Joomla website, you can create as many menus as you want. Every menu can contain one or more menu items; each menu item points to a page on the site. The default sample site that you installed in Chapter 2, Getting Joomla! Up and Running, is an example, as it contains no fewer than six menus. On the home page, four of them are shown: User Menu (only displayed after a registered user has logged in to the site), the horizontal Top menu, the About Joomla menu, and Main Menu (titled This Site). In the following screenshot, you can see how the frontend menus are reflected in the administrative interface:
The Australian Parks menu and the Fruit Shop menu have been added to the sample data for demonstration purposes; they're only used on the Parks and Fruit Shop example site pages.
At least one menu is needed for Joomla to function properly—the menu containing the link to the home page. By default, that's the menu called Main Menu. The other ones are only there...
