Discrete measure

A discrete measure is like a way of counting things, but only certain things that you can easily count one-by-one. For example, if you have a bag of apples, you can count how many apples are in the bag because they are all separate and you can see each one. But if you have a carton of apple juice, you can't count how many apples were used to make the juice, because they are all mixed together and can't be separated. A discrete measure only works for things that can be easily separated and counted, like the apples in the bag. It's like counting how many toys you have in your toy box, or how many fingers you have on your hand - they are separate and easy to count, which makes them "discrete".