Explain Like I'm 5

Gravity is like a big hug from the Earth. The Earth wants to keep you close, so it pulls you towards itself. That's why you don't float off into space when you're standing on the ground.

Imagine you have a ball, and you throw it up in the air. What happens? It comes back down, right? That's because the Earth is giving it a big hug, pulling it back down to the ground. The Earth is like a big, strong mom, and gravity is her way of keeping you safe and close.