Thousands of years ago, when most people were hunters of farmers, bartering worked pretty well. as lives became more complicated, bartering did too. confusing, isn't it? they needed a better way to do business.
you've seen a lot of penny at the store, in your pocket, on even between the cushions of the couch, penny and some of other coins. all together, they make up something called money.
money is what people use to buy the things that need. a lonh time ago, people didn't use money. they would tarde something they owned for something that they needed.