What Is Quantum Tunneling?

Quantum tunneling is like when a ball rolls toward a wall, but instead of stopping, it just passes through the wall. It's like magic! Imagine you're trying to get out of your room, and there’s a door that’s closed, but somehow, you just appear on the other side without touching it. That’s what quantum tunneling is: tiny particles passing through barriers without needing to go all the way around them.