Okay kiddo, do you know what a trustee is? It's like a babysitter but for money or property. They take care of important things for someone else.
Now, an executorial trustee is a special type of trustee. They are in charge of making sure that someone's wishes are followed after they pass away. This means they make sure that things like money, property, and other important things are given to the right people according to the person's will or last wishes.
It's kind of like being a superhero that makes sure everything goes the way it's supposed to after someone can't take care of it anymore.