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Barter was used for a very long time in the early days until humans came up with other methods for trade, such as money. Barter, means to trade goods for one another and services without using money.

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The aes rude was a big bronze brick, that weighed 324g.  The Romans would use it as a measurement of trade in the Roman Republic.

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Because the aes rude wasn't very precise, and the Roman Empire was expanding, Rome needed to establish a new system. The coin system allowed everyone to work in pursuit of coins, and pay taxes. The coinage system also helped to pay the Roman military which strengthened the military.

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Paper money started in China but has spread, and is still used all around the world today. However it has adapted due to reasons such as counterfeit.

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With more advanced technology and credit systems we have advanced to online payments such as Apple Pay and PayPal. In the future we might see only online payment and no cash or coins at all.