Okay kiddo, so a roundhouse is just like a house, but instead of being shaped like a rectangle or square, it's shaped like a circle!
People in different parts of the world used to build roundhouses as a way to live in a comfortable and sturdy home. They would usually make the walls out of a material like wood or stone, and then put a roof on top that sloped down towards the ground.
The cool thing about roundhouses is that they can actually be really strong and safe, even in bad weather like strong winds or heavy rain. They were also often built with a fireplace in the middle, so the whole family could stay warm and cook food.
Nowadays, people don't build roundhouses as much anymore since we have other types of homes that are easier to build and more practical. But some people still find them really interesting and even choose to build their own roundhouses as a fun project!