Menu bar

A menu bar is a graphical control element which contains drop down menus. The menu bar's purpose is to supply a common housing for window- or application-specific menus which provide access to such functions as opening files, interacting with an application, or displaying help documentation or manuals. Menu bars are typically present in graphical user interfaces that display documents and representations of files in windows and windowing systems but menus can be used as well in command line interface programs like text editors or filemanagers where drop-down menu is activated with shortcut key or combination.

Through the evolution of user interfaces, the menu bar has been implemented in different ways by different user interfaces and application programs.

In the Macintosh operating systems, the menu bar is a horizontal "bar" anchored to the top of the screen. In macOS, the left side contains the Apple menu, the Application menu (its name will match the name of the current application) and the currently focused application's menus (e.g. File, Edit, View, Window, Help). On the right side, it contains menu extras (for example the system clock, volume control, and the Fast user switching menu (if enabled) and the Spotlight icon. All of these menu extras (excluding Spotlight) can be moved horizontally by command-clicking and dragging left or right. If an icon is dragged and dropped vertically it will disappear with a puff of smoke, much like the icons in the dock. In the classic Mac OS (versions 7 through 9), the right side contains the application menu, allowing the user to switch between open applications. In Mac OS 8.5 and later, the menu can be dragged downwards, which would cause it to be represented on screen as a floating palette.

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