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The United States Dollar, often abbreviated as USD, is the official currency of the United States of America and its territories. It is also widely used as a reserve currency by other countries and is the most traded currency in the world. The USD is issued by the Federal Reserve, the central banking system of the United States.

The currency is divided into 100 cents. Its symbol is '$' and its ISO 4217 code is USD. The United States Dollar exists in both physical and digital forms. Physical currency includes coins and banknotes. Coins are minted in denominations of 1, 5, 10, and 25 cents, as well as 1 dollar. Banknotes, commonly called bills, are printed in denominations of 1, 2, 5, 10, 20, 50, and 100 dollars.

The USD plays a significant role in global finance and trade. Its stability and widespread acceptance make it a benchmark for many international transactions and investments. Fluctuations in the value of the USD against other currencies can have a substantial impact on global markets. The Federal Reserve's monetary policy decisions, such as setting interest rates, are closely watched by international observers due to their influence on the dollar's value.