Learn about the U.S. dollar, the official currency of the U.S. and its territories. Find out about the denominations, history, and features of U.S. paper money and coins. The United States Dollar refers to the national currency of the U.S and is represented by the ISO code USD and is often abbreviated as US $. For the coin, see Dollar coin (United States). The United States dollar (symbol: $; currency code: USD[a]) is the official currency of the United States and several other countries. Use our free USD to INR converter for the latest US Dollar to Indian Rupee exchange rate. View charts, tables, and get a transfer quote.