The Applications menu contains a hierarchy of submenus from which you can start the applications that are installed on the system.
Each submenu corresponds to a category. For example, in the Sound & Video submenu, you will find applications for playing CDs and to record sounds.
When you install a new application, it is automatically added to the Applications menu in a suitable category. For example, if you install an instant messenger application, a VoIP application, or an FTP client, it is placed in the Internet submenu.
Each submenu opens as you hover the mouse over the category.