This saves time on dragging the mouse to the Start menu button on your screen. The Windows key quickly brings up the start menu which is the most common procedure on a Windows computer.
Some keyboards also have two on the right and on the left of the keyboard.
This is a physical key with the Microsoft Windows logo embedded on keyboards usually on the left of the keyboard which is linked to the Start Menu, so when you press this key Start menu opens and if it doesn’t open the either the Start Menu or the Windows button is not working. Since the invention of the start menu, keyboards have had the Windows key (also known as the Winkey).
