Money? What is money?

About money
Money is anything that is commonly accepted by a group of people for the exchange of goods, services, or resources. Nowadays, we use money to buy goods and services and to pay debts. Most people use money everyday and use cash (coins, banknotes) to pay for smaller purchases.
Every country has its own system of coins and paper money. Governments make coins and banknotes from paper, plastic or metal and assigns each a value. These coins and banknotes are then used to make and accept payments.

Why does money have value?
Money is valuable because people believe that people will accept it in exchange for valuable stuff and people are willing to accept it in exchange for valuable stuff because they believe it will hold its value. Which boils down to "money is valuable because people believe it will hold its value".