It is 0 to 100 to far but there is more to it than that. For example, you can eter values such as 75.25 or 99.1. You are not locked into integer values like 1 to 100 or 1 to 255. The idea is that you are not restricted into 8 bit values but in my opinion, they are kinda going the wrong way. Do we really need 64 bit controllers to control Christmas lights???