Transhab is like a really cool house in space that astronauts could live in for a long time. It looks like a big balloon that you blow up, but it's made out of special materials that can block out radiation and keep the air inside safe and clean for the astronauts to breathe.
Inside the transhab, there are different rooms for things like sleeping, eating, and exercising. There's also a special area for the astronauts to do their work and experiments, kind of like a space laboratory.
The transhab is really handy because it's more comfortable for astronauts to live in than the smaller spaceships they usually fly in, and it can stay in space for a longer time without needing to come back to Earth. That means people could explore more parts of space and stay up there longer, learning more about the universe and how we might be able to travel further and further out from our planet.