Picture a box full of toys. When you don’t want to play with some toys anymore or they are broken, you put them in a special place called a dump. It’s where things go when they are not needed anymore. Think of it as a big toy box for the whole town where people put things they don’t need.
Now, imagine if you have a cup of juice. If you don’t want it anymore, you might pour it out. That’s like dumping juice! The juice goes away because you don’t need it anymore. The dump is like the ground where the juice goes.
Another way to think about it is like a computer. When you have too many files and your computer is too full, you might delete some of them. Those files go away, just like toys go to the dump. The computer gets more space, just like your room gets cleaner when you put toys away.