These two photos show my understanding of ISO.
Low ISO
ISO- 100
Aperture- f/5.6
Shutter Speed- 6.0
High ISO
ISO-3200
Aperture- f/5.6
Shutter Speed- 1/6
ISO is how sensitive a digital camera's sensor is to light. The lower the number, the less sensitive to light image sensor is. The higher number indicates a higher sensitivity to light, thereby allowing the image sensor to work better in low light conditions. In the photograph the higher the ISO the more "noise" there will be in the photograph. Light entering the camera is what the Exposure Triangle is all about, ISO is how sensitive that light is to the image sensor.
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