Okay, kiddo, let me explain! NASA is a place where really smart and talented people work on cool stuff like rockets and spaceships that go to space. They want to make sure that their work is really good, so they created something called the realworld-inworld engineering design challenge.
The first part, the realworld, means that they give a real-life problem to solve. For example, they might want to find a way to help astronauts breathe better on a spaceship. The second part, the inworld, means that they create a pretend world where you can design and test your ideas before you actually build them in the real world.
So, they ask kids like you to use their imagination and creativity to come up with an idea to solve the real-life problem. Then, you get to use special software to design your idea and test it out in the pretend world. You can see if it works and make changes if you need to.
Once you have a good idea that works well in the pretend world, you can take it to the real world and build it. If it works in the real world, you might just have come up with a solution that NASA can use to help astronauts in space.
So, by taking part in NASA's realworld-inworld engineering design challenge, you get to use your brain and creativity to help solve a real-life problem. Who knows, you might even become a super space inventor one day!