The U.S. dollar ($), the official currency of the United States of America and the world's primary reserve currency over the past several decades. It is managed by the Federal Reserve, America's central bank.

In foreign exchange (forex) markets, the USD is the most common pairing in exchange with other currencies; for instance, EUR/USD, USD/JPY, and GBP/USD. The U.S. dollar is also the official currency for a small number of other nations such as The Marshall Islands, Panama and Ecuador, and is unofficially accepted in local exchange in several other countries around the world.