Shutter speed is a measure of how long the aperture on a camera is open, which determines
how the exposure time of the picture. For fast moving, a smaller exposure time will result in
less blurring of the picture. For bright objects, smaller exposure times will lead to greater contrast in the image.
The shutter speed of a camera is the time it takes for the aperture to open and close, allowing light inside to the film. The speeds can range from the bulb setting which leaves the aperture open, to as fast as 1/1000 of a second, and are usually marked in the settings or on top of the camera.
Shutter Speed refers to how quickly the lens closes on a camera while it is taking a picture. The faster speeds are good for subjects that are moving, such as people, moving vehicles and floats going by in parade, while the slower speeds are good for night or landscape pictures.
Shutter speed is the speed at which the shutter on a camera opens and closes. What that really means is the amount of light that will make contact with the film. In good light conditions, you may have to trade off higher aperture for a faster shutter speed. The faster the shutter speed the more stop on the action.
The shutter on a camera opens to allow light to reach the film, or digital plate. Then it closes again to stop over exposure of the image, the time that it stay open is called the shutter speed. In normal daylight this would tend to be 1/250th of a second but can be much longer.