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Menus contain commands that you can choose to perform various actions. All applications have their own menus, but most applications provide at least standard options, including File, Edit, View, and so on. Applications also have a menu that is named with the application’s name. For example, the Finder menu appears when you are working on your desktop using the Finder application.
The Apple menu, located on the left end of the menu bar, is a special menu because it almost always appears regardless of what you are doing. It contains system-level commands that you might need at any time, which is why it is always available.