Originally Posted by joebenz
lets say...for a sports event such as a basketball game played in a gym. want to take pics of they players as they are playing, but dont want them to be blurry
set a very high shutter speed. The shorter amount of time the aperture is open, the less likely the object that is moving will be blurry. But, because the shutter speed is higher, it lets in less light meaning that its got to be fairly bright out in order for the subject thats being photographed to be seen without the picture being too dark.