Okay, so you know how when you play a game with your friends, there are some rules that everyone has to follow? And if someone breaks the rules, they might get in trouble or lose the game?
Well, grown-ups have rules too, and they use them in a special way called "law". When someone breaks a law, they might get in trouble with the police or go to court.
But how do the grown-ups know what the rules actually are? That's where the "precedent book" comes in.
The precedent book is a big book that has all the important decisions that judges have made in the past. It's like a really smart person's diary, where they write down what they think about different situations and how they made their decisions.
So, when a judge has to make a decision about something, they can read the precedent book and see what other judges have done in similar situations. This helps the judge decide what the right thing to do is.
It's kind of like following a recipe when you're baking cookies. You look at what other people have done before and use that as a guide to make your own cookies. The precedent book helps judges make good decisions and keep everything fair and equal.