On a film camera, the speed of the film you use is given as its ISO. Digital cameras have an equivalent setting, called its "sensitivy." This indicates the camera's sensitivity to light and the amount of light it needs to take a photograph. For most everyday pictures, a camera's automatic ISO setting works fine. But for exceptional circumstances, you could do well to make the ISO setting higher or lower.
Shutter speed is the rate at which your camera's "eye" opens and closes. A slow shutter speed lets you intentionally capture the movement of an object. A fast shutter speed, by contrast, "freezes" the moving object.
Both high ISO settings and long shutter speeds require you to use a tripod or firm, steady surface to set your camera on, in order to get the clearest pictures you can.
Experiment with your digital camera. Try changing the ISO and shutter speed under a variety of conditions to see which give you the best results.
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