Shutter Speed is one of the three pillars of photography, the other two being ISO and Aperture. Shutter speed is where the other side of the magic happens it is responsible for creating dramatic effects by either freezing action or blurring motion.Shutter speed also known as exposure time stands for the length of time a camera shutter is open to expose light into the camera sensor. If the shutter speed is fast it can help to freeze action completely as seen in the above photo of the dolphin. If the shutter speed is slow it can create an effect called motion blur where moving objects appear blurred along the direction of the motion.This effect is used quite a bit in advertisements of cars and motorbikes where a sense of speed and motion is communicated to the viewer by intentionally blurring the moving wheels.