Well, kiddo, imagine a big river called the Murray-Darling. A long time ago, people wanted to travel on this river but without swimming because it could be dangerous. So, they made boats called steamboats that could float on the river.
These steamboats used steam to move, just like a kettle in your kitchen. They had a big engine that burned wood or coal to heat water and create steam. The steam would then power a big paddlewheel at the back of the boat, which spinned and pushed the boat forward. Just like when you paddle with your arms and legs to move faster in the pool, but a paddlewheel is much bigger!
These steamboats were really important for people who needed to travel long distances to deliver goods or visit other towns. They could move faster and carry more things than by walking or using horses.
But, as time went by, steamboats became less popular because they were expensive to run and other forms of transportation, like trains and cars, were becoming more common. Nowadays, we don't see many steamboats on the Murray-Darling anymore, but we can still learn about them and how they helped people live and work along the river a long time ago.