Explain · Like I'm five version
Gravity in terms of a trampoline park
Gravity is basically a giant trampoline park that never lets you leave.
Imagine the whole Earth is like one big room filled with bouncy floor mats. Every time you try to jump up, the floor reaches out with invisible hands to pull your trainers back down to the plastic. It does not matter if you are trying to jump over a puddle or reach for a biscuit on the top shelf, the ground is always waiting to catch you. It is quite greedy, really, because it wants to hold onto everything from your favourite football to your loose change.
Everything in the world acts like a tiny ball bouncing on this huge park. The closer you are to the middle of the bouncy bit, the harder the floor pulls you down. This is why the moon can float around the sky instead of falling into our tea; it is just bouncing along the edge of the park where the floor is not quite as grabby. It keeps all the planets doing a big, slow circle instead of just flying off into the dark cupboards of space.
If you throw a ball, the trampoline floor curves its path until it has to come back home. It is a very polite system that makes sure nothing ever gets lost in the ceiling. It keeps our feet on the grass, our cars on the road, and our gravy inside the bowl where it belongs. It is the best bouncy castle you could ever have, even if it does refuse to let you fly.
Where the analogy breaks downA trampoline park pushes you up when you land, whereas gravity pulls you down and keeps you there.