Propeller

A propeller is like a big spinning fan that goes on boats and airplanes. It's like the tail of a kite, but instead of going side to side, it goes round and round really fast. The propeller helps the boat or airplane move through the water or air by creating thrust, which is like a big push that makes the vehicle go forward. It's almost like riding a bike and pedaling to make the wheels turn and move you forward. Without a propeller, boats and planes wouldn't be able to move very fast or at all, like trying to ride a bike without pedals.