What is Shutter Speed?
Shutter speed is the time that the shutter stays open on the camera.
The longer the shutter speed, the more light is let in and the brighter the picture. Some cameras allow infinite light exposure so you will need to use a smaller aperture setting.
The shorter the shutter speed, the less light is let in to the film, and the darker the picture. Shorter shutter speeds can be from 1/250 of a second up to 1/3200 sec.
In bright outdoor sunlight, generally a shorter shutter speed is needed. For late evening or night pictures, and much longer shutter speed is needed.
with a longer shutter speed, you can also get the motion blur on things like waterfalls, cars driving etc