ISO is how sensitive the sensor in the camera is to light.
Low ISO = Low Sensitivity to Light
High ISO = High Sensitivity to Light
The ISO numbers double as they increase: 100 - 200 - 400 - 800, etc. Notice that this means each setting makes the camera twice as sensitive to light as the previous setting.
The ISO ranges from 100 to 3200 and above. There is also a "High 01" and High 02" setting.
Here are some links that go into greater detail about ISO.
https://photographylife.com/what-is-iso-in-photography
http://digital-photography-school.com/iso-settings
http://www.digitalcameraworld.com/2014/02/19/what-is-iso-camera-sensitivity-settings-and-the-best-ways-to-use-them/
You should always try to use the LOWEST ISO POSSIBLE to obtain the best quality image.
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