What is the main difference between a single action revolver in a double action revolver?

The main difference between a single action (SA) and a double action (DA) revolver lies in how the trigger operates. In a single action revolver, the trigger only releases the hammer after it has been manually cocked, requiring two distinct actions to fire. In contrast, a double action revolver can both cock and release the hammer with a single pull of the trigger, allowing for quicker shooting without the need to manually cock the gun each time. This difference affects the speed and ease of firing in various situations.