Explain Like I'm 5

Gravity is like a big hug from the Earth. The Earth wants to keep you close, so it pulls on you. Imagine you have a big ball, and you throw it up in the air. What happens? It comes back down to the ground, right? That's because the Earth is giving it a big hug and pulling it back down. The Earth does the same thing with you, so you don't float off into space. It's like a big, gentle hug that keeps you safe on the ground.