ISO & Exposure
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ISO is the sensitivity of the sensor to light. The lowest setting is usually ISO100, and it goes up into the thousands. Doubling the ISO doubles your sensor’s sensitivity to light so that it requires half as much light to create the same exposure.
Lower ISO settings give the best quality images, whereas very high ISO settings result in slightly lower quality images due to noise (grain) and some colour degradation.
Because less light is needed, using higher ISO settings allow you to use faster shutter speeds, which can be useful when you don’t have much light and want to avoid camera shake that is caused by using a shutter speed that is too slow.