Currency
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Currency is a unit of money that facilitates the purchase of goods or services. Each modern nation has one currency, such as the U.S. dollar in the United States, the pound sterling in The United Kingdom, and the Euro in several countries across Europe.
More specifically, currency is something (as coins, treasury notes, and banknotes) that is in circulation as a medium of exchange, paper money in circulation, or a common article for bartering. [1]
The invention of currency allowed civilization to advance beyond the barter system.