The Tiangong Program is a big project that China is doing to explore space. Imagine that you are playing a game and you want to explore a new level. The Tiangong Program is like exploring that new level, but instead of us exploring it, machines and robots are doing it for us.
China has built a lot of cool machines and robots that can fly really high up into space. They built a special machine called Tiangong-1 that was like a big space apartment. It was like having a really big camping tent in space that astronauts could stay in.
But the Tiangong-1 machine got old and it needed to be replaced with a newer one called Tiangong-2. Tiangong-2 was even better than the old one because it had more rooms and more toys to play with. It also had better tools for experiments and studying space.
China wants to keep exploring space and learning more about it. So, they are planning to build even cooler machines and robots in the future to keep exploring space. The Tiangong Program helps us learn new things about space, just like how we learn new things when we go to school.