When a computer is fully on, you can see icons on the desktop screen. The desktop has three main elements: icons, the Start menu, and the taskbar. Icons are small pictures that represent files, folders, programs and other items. There are five categories of icons: folder icons, program icons, document icons, shortcut icons, and system icons. The Start menu contains files, folders and programs and can be accessed by clicking the Windows logo. The taskbar displays shortcuts and icons for running apps and provides quick access to files, folders, and open windows.