Any approved currency issued by a central bank or monetary authority as the official unit of account for valuation of foreign exchange and payment of debts. Also called monetary unit. In the United States, Federal Reserve Notes issued by the Federal Reserve Banks are the official national currency. See also Legal Tender.
The currency or legal tender issued by a nation's central bank or monetary authority. The national currency of a nation is usually the predominant currency used for most financial transactions in that country.
Investopedia Says:
A handful of national currencies such as the U.S. dollar and the euro have achieved global status as reserve currencies and are extensively used in international trade transactions. The euro has supplanted the national currencies of a number of nations that comprise the European Union. The national currencies of some countries such as the United Arab Emirates are pegged or fixed to the U.S. dollar.
Related Links:
Find out how fledgling economies can find some stability in their currency and attract foreign investment. Dollarization Explained
Find out which currencies are most affected by fluctuations in gold and oil prices and improve your trading. Commodity Prices And Currency Movements
Take advantage of foreign currency markets without stepping out of your house. The New World Of Emerging Market Currencies
Learn how the Bretton Woods system got the ball rolling for world trade. Global Trade And The Currency Market
Find out what can cause a currency to collapse and what central banks can do to help. What Causes A Currency Crisis?