Okay kiddo, have you ever seen a unicycle? A monowheel is a bit like that but with an engine and a seat attached. Picture a big wheel with the seat and handlebars sticking out of the top, kind of like a fancy bicycle seat.
When you ride a monowheel, it's kind of like being on a rollercoaster that you can control. You sit in the seat and use your feet to balance and move the wheel. It takes some practice to get the hang of it, but once you do, it's a lot of fun!
Monowheels are pretty rare because they can be kind of tricky to make and ride safely. But some people really like the challenge and the feeling of being in control of such a unique machine. And who knows, maybe one day you'll decide to give it a try!