It depends on the gun. With old fashioned revolvers pulling the trigger only released the hammer. You had to manually cock the hammer with your thumb or other hand to fire the gun. This is why you see people in westerns “fan the gun” if they are going to fire it rapidly. If you have not cocked the hammer the trigger does nothing.
With modern guns cocking is not necessary and so done only for effect to show the threat level to the audience in movies. Some guns cannot even be cocked in modernity.
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