High ISO
Low ISO
ISO is the measure of a digital camera sensor's sensitivity to light. Visually, a picture taken with a lower ISO is brighter and doesn't look as grainy. In a camera, the ISO is what takes in the light and forms the image. This is related to the shutter speed and the aperture because the aperture is the size of the opening that lets light in and the shutter speed controls the amount of time the shutter is open.
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