ISO

What is ISO?
ISO is sensitivity of your camera to available light.
How does ISO work technically (camera) and visually (in photo)?
When the ISO was at 100 we had to make the shutter speed lower, which made the quality of the picture clearer. However, as the ISO began to get higher we made the shutter speed higher, which made the picture more grainy and not as clear.
What happens to the exposure triangle when you change your ISO? 
As we changed the ISO we had to change the shutter speed as well. For instance, when the ISO was at 100 we lowered the shutter speed. However, when we kept making the ISO higher we had to make the shutter speed higher. We also kept the f stop the same while working with ISO.