Measurable function

A measurable function is like a recipe that tells you how to make something. You give it some ingredients, and it tells you what comes out at the end. For example, if you tell it the ingredients are 2 apples and 3 oranges, it might tell you that you get 5 pieces of fruit. Measurable functions can be used to help us understand all kinds of things in our world, like how much rain falls on different days or how much energy lights use.