ISO measures the sensitivity of your image sensor in your camera. The lower number means the less sensitive your camera is to light. These are the pictures that come with less of that grain. The higher number means your camera is more sensitive to light. This can lead to more of that grain look.
If you shoot in low light situations, it will call for higher ISO. What you have to look for is to keep your ISO as low as possible. You can do this by learning the relationship between ISO, shutter speed and aperture.
There are cameras (DSLR's) that can perform well at high ISO's. That's a blessing to photographers who shoot in those darker settings. But, most important is knowing the relationship so that you can use your camera to the best of your ability.
Once you have a real understanding of how the three work together, your shooting ability will change. You will then be able to take on challenging shots and do so with confidence.
I highly recommend reading this book.
You can get your own copy here
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