Imagine a giant hula hoop around the Earth, way up high in space. This is called an orbit. When something is in orbit, it's like it's spinning around the Earth without ever touching it.
Now imagine you have a toy car on this hula hoop. The car is moving in a circle around the Earth, but it's also moving really fast. That's because the car has to move fast enough to stay in the same spot in the sky above the Earth.
This is what we call a geosynchronous orbit. It's a special kind of orbit that's really high up, about 22,236 miles above the Earth. The thing that's orbiting the Earth, like our toy car, stays in the same place in the sky all the time.
This is really useful for things like communication satellites, because they need to be able to transmit signals to us on Earth all the time. If the satellite was moving around, it would be harder to keep track of it and keep getting the signal.
So, that's why we use geosynchronous orbit. It's like having a satellite that's always parked in the same spot in space, waiting to talk to us.