One thing I learned from the Cambridge in Colour website on the topic for Camera Exposure was that ISO speed is a lot like aperture and shutter speed. ISO speed is the sensitivity of the camera to light. Having a higher ISO means the camera is more sensitive to light, and vice versa. The way they are different is that a lower ISO is more commonly desired. This is because a higher ISO speed will make your image way too grainy, or have a higher image noise like the picture below:
The sky in the picture on the right looks more grainy because the ISO number is very high unlike the picture to the left.
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