Okay, little buddy! You know how sometimes when you're riding your bike, you have to turn really fast to go left or right? Well, airplanes need to do something a bit like that when they are flying in the sky! This is called 'rolling.'
When an airplane has to change direction, it needs to roll a little. Imagine if an airplane is flying straight, and then it wants to turn left, it tilts its wings just like how you might lean your body when you turn your bike. This helps the airplane go the way it wants to go without falling down.
Sometimes airplanes roll when they are getting ready to land or when they want to climb higher in the sky. It's like when you’re going up a hill on your bike and you have to lean a bit forward!
So, in short, airplanes roll to turn and to stay safe while flying! Isn’t that neat?