Okay, little buddy! Let's talk about airplanes and their wheels!
Airplanes have big wheels just like cars, but they use them at different times.
First, when an airplane is on the ground, the wheels help it move. This is when the airplane is taxiing, which means it is rolling to get ready to take off. It’s like when you ride your tricycle on the street!
Next, when the airplane takes off into the sky, it lifts off the ground and the wheels go up. They don't need them anymore because they are flying high!
Lastly, after flying, when the airplane comes back down, the wheels come back down too! This helps the airplane land safely on the ground, just like when you stop your tricycle.
So remember: airplanes use their wheels on the ground to go and stop, but they don’t need them when they are flying in the sky!