Lightning is like a big spark of electricity that happens in the sky during a storm. Imagine when you rub a balloon on your hair and the hair stands up; that's a little bit like what happens with lightning!
When the clouds in the sky bump into each other, they get a lot of energy built up. This energy can make a bright flash of light — that's lightning! It usually comes with a loud sound called thunder, which is like the clouds clapping their hands.
Sometimes, lightning lights up the whole sky, and it can be very beautiful! But it's also very powerful, so it’s important to stay indoors when there's a storm with lightning.
So remember, lightning is just nature's way of showing us energy in the sky! It's fun to watch from the safety of our homes.