Okay, kiddo! Let's talk about dumpers. A dumper is a special big truck that doesn't have a roof, just like how some toy trucks are open!
Now, what do dumpers carry? They carry things like gravel and sand. Imagine building a sandcastle at the beach; you need sand, right? Well, dumpers help bring that sand to places, like building sites!
Because dumpers are open on top, the sand and gravel can sometimes be seen when they drive by. And guess what? To keep those materials safe from the sun or rain, they have ways to cover them up if it rains or if it's super sunny!
So, in short, dumpers are strong trucks without roofs that help carry stuff like sand and gravel, making sure they're safe all the time!