Okay kiddo, have you ever seen a road being built? They use something called asphalt to make the road flat and smooth. But in some places, they don't use asphalt. Instead, they use a material called sarooj.
Sarooj is a special type of mud that people in the Middle East have been using for thousands of years to make buildings and roads. It's like a type of clay that is found in certain areas.
When they want to make a road using sarooj, they mix it with other things like sand and rocks to make it stronger. Then they lay it down in layers and let it dry. This makes it hard and durable, so people can walk or drive on it without it breaking apart.
But sarooj is not always easy to find, and it takes a lot of work to make a road using it. That's why in many places, they use asphalt instead. But in places where sarooj is plentiful, it's still used to make strong and long-lasting roads.
So next time you see a road in the Middle East, you might be able to tell if it's made with sarooj or with asphalt.