ISO measure the sensitivity of the image sensor. A lower ISO setting has smaller grain meaning the image will be a better quality, whereas a higher ISO setting has a higher grain meaning the image will be a poorer quality.
This clips shows demonstrations of ISO 100 and 200, because of the low ISO setting the image is a clear high quality with a small amount of grain; if it was a higher ISO setting there would be a higher grain making the image quality poor and there's also a chance it may have been overexposed if I'd have left all other settings the same for a low ISO.
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