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Currency is the unit of money used by the people of a country or a union of countries for buying and selling goods and services. Certain currencies are said to be "pegged" or "fixed" to something, usually another currency.
The United States dollar (or American dollar) is the official currency of the United States of America. It is also used in some other countries outside the US. It is the standard currency for international markets selling goods such as gold and oil . When writing, the symbol for the American dollar is the dollar sign ($).
A reserve currency is a foreign currency that is held in significant quantities by central banks or other monetary authorities as part of their foreign exchange reserves. The reserve currency can be used in international transactions, international investments and all aspects of the global economy.
