Before the invention of coins and banknots,people in the world used such things for buying and selling
Some of them used the animals or vetgatables as money. Then in 1200 BC the Chinese began to use a cowrie shell as money for selling and buying goods and service. It was use longer in mor place. 200 years later, A Chinese started making bronze and copper cowrie shell. It wasn't long.Afterthat they made round metal coins.At first,a coin had hole in it for pass a piece os sting through its to keep with the other coins.
The metal coin was used in many couties such as Persia, Greece and Roman Empire. These were usually stamped on the coins with the heads of various goods and emperor that shown the coin is real.