A foreign currency held by central banks and other major financial institutions as a means to pay off international debt obligations, or to influence their domestic exchange rate. A large percentage of commodities, such as gold and oil, are usually priced in the reserve currency, causing other countries to hold this currency to pay for these goods.  Holding currency reserves, therefore, minimizes exchange rate risk, as the purchasing nation will not have to exchange their currency for the current reserve currency in order to make the purchase. 

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In 2011, the U.S. dollar was the primary reserve currency used by other countries. As a result, foreign nations closely monitored the monetary policy of the United States in order to ensure that the value of their reserves is not adversely affected by inflation.