How do SpaceX Dragon missions resupply the ISS?

A SpaceX Dragon is like a super cool delivery truck that goes all the way to space to bring supplies to astronauts living on the ISS, which is like a big house floating in space.

Imagine you’re playing with your toys, and your friend lives far away. You want to send them a new toy, but it’s too far to walk. So you put the toy in a special box, that's like a Dragon spacecraft, and send it flying through the sky on a rocket. The rocket is like a super fast car that takes the box all the way to your friend.

The ISS is like a big space station where astronauts live, and they need food, water, and new tools to keep working. The Dragon spaceship arrives at the ISS like a toy truck arriving at your friend’s house, it docks with the station so the astronauts can open the box and take out all the cool stuff inside.

Sometimes, the Dragon also brings back things from the ISS, like used toys or samples from space experiments, kind of like how you might send your friend a drawing in return for their new toy.