Musical Theatre is a live show where actors perform on a stage.
Some popular Theatre shows are:
If you ever see a Musical Theatre performance, there would probably be props. Props are used to represent something. People usually use props to repressent food, because they have to practice with it. If they really did use real food, it would get all stinky and saugy in a couple of days!
If you've seen a play before, you probably noticed performers disapearing into the sides of the stage. Those are called 'The Wings'. After running through the wings, they will enter backstage where people might help them change costumes and get them ready for the next scene. Also, the props would be backstage.
Broadway is the place where the best performers in the world make a play and perform. Broadway is located in New York City on Broadway street. A fun fact is that Broadway street is the only diagonal street in New York. If you go to New York, there will be many adds about plays, so don't worry. You won't miss it!