What is the use of Windows key in keyboard?

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What is the use of Windows key in keyboard?
Just pressing the windows key alone will show the 'start' menu. But you can also use this key for many other shortcuts when combining this key with another letter. Here are the list of windows key shortcuts.
Win key + R : To open 'Run' box in Start Menu

Win key + F : To 'Find' window in Start menu

Win key + E : To open Windows Explorer

Win key + Pause/Break : To open System Properties

Win key + M : All open windows will be minimised

Win key + Shift + M : All minimised windows will open

Win key + D : Will show all minimised windows

Win key + Tab: Will rotate and select programs in the task bar