J.L. Moreno was a very smart man who invented something called "psychodrama". This is a fancy way of saying he created a way for people to act out their problems and feelings in a group setting.
He believed that by doing this, people could understand themselves better and learn how to deal with problems in a healthier way.
Think of it like playing pretend with your friends. You get to be a character and act out different situations that you might be going through in real life. But instead of just pretending, you're really exploring how you feel and what you can do to make things better.
J.L. Moreno also came up with something called "role playing". This means that you act out a scenario where you are pretending to be someone else, like a doctor or a teacher. This helps you understand the feelings and experiences of other people, which can be very helpful in real life.
Overall, J.L. Moreno was a clever man who created fun ways for people to explore their emotions and learn how to handle different situations in a healthy way.