Shutter speed is the length of time the digital sensor in a camera is exposed to light and when a cameras shutter is open. the longer the shutter opens and closes the more light gets in the camera. A long shutter speed would capture moment resulting in the image looking blurred whereas a short shutter speed freezes things without much movement so you can photograph fast moving things like animals and cars . It is measured in seconds or fractions of a second depending on what it is set to.
This diagram represents the different settings for shutter-speed. when the shutter-speed is low you can get blurry pictures for effect and it displays the movement slowly.T he best way to capture that would be on 1/2 , 1/4 , and 1/8 of a second. On the other hand for a clear and precise photo of movement you could put your camera setting on 1/125 + of a second