Okay, so imagine you're playing a game with your friends, but you need some rules to know how to play the game right. Jury instructions are kind of like rules for grownups when they are deciding if someone did something wrong or not.
When someone is accused of a crime, a group of people called a jury (kind of like your group of friends playing the game) needs to decide if that person really did it or not. But they can't just decide based on what they think - they have to follow some rules, and those rules are jury instructions.
Jury instructions are like a list of things the jury needs to think about when they are deciding if someone is guilty or not. These instructions tell the jury things like what the law says, what the evidence means, and how they should discuss things with each other.
For example, the instructions might say that the jury needs to think about whether the evidence is really strong enough to prove that someone is guilty beyond a reasonable doubt. Or it might say that the jury can't just guess or make things up - they have to base their decision only on what they've heard and seen during the trial.
Finally, the judge (kind of like the teacher in school!) reads the jury instructions to the jury to make sure everyone knows how to make their decision fairly and based on the rules.
So, jury instructions are like a list of important things the jury has to consider when they are deciding if someone is guilty or not - just like rules for a game you play with your friends!