In Digital Photography ISO is the sensitivity level of the image sensor. So if the camera has lower ISO number/value it means that camera is less sensitive to light and its image sensor is not much sensitive.
On the other hand, Higher numbers of ISO mean the sensor of camera is more sensitive to light which will let you use your camera in darker situations as given in the question. Here is an example where you want to fix the camera on a higher ISO is whenever there is less light like in an indoor event or dark location where light is not much. By choosing a higher ISO the shutter speed will get faster and you will be able to freeze the movement and you can get better image.
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