Every day we always transact using money, whether receiving, paying, sending or just saving in the bank, currency has also become a country's logo, such as USD, AUD, PESO, YEN, NAIRA, INR, IDR etc. and each currency from a country will have a different value (exchange rate), even a country's economy will not be able to run without money. But unfortunately until now I don't understand what the functions of money are, can you explain what the functions or roles of money are in our lives?