The American dollar is the most used currency in international transactions and the official currency of the United States. Outside of the U.S., it is also the official currency of Panama, Ecuador and El Salvador. It is used as the sole currency in some British Overseas Territories, such as Bermuda, British Virgin Islands and Turks and Caicos.
The dollars can broken down into coins, such as pennies, nickels, dimes and quarters. More rare coins include the 50 cent coins and $1 coins. Frequently used banknotes include $1, $5, $10, $20, $50 and $100. Banknotes above $100 stopped being printed in 1946 and were officially taken from circulation in 1969.
U.S. dollars are made from cotton fiber paper and are printed by the Bureau of Engraving and Printing. Since 1914, they have been issued by the Federal Reserve.