USD is the official currency of the United States and its territories. It's the world's primary reserve currency and the most widely used currency in international transactions.

The dollar is managed by the Federal Reserve and is used as the benchmark currency for commodities like oil and gold. Many countries peg their currencies to the USD or use it as legal tender alongside their national currency. Some dollarized economies use the Panamanian balboa (PAB), and the XDR basket includes USD. ISO 4217 reference: ISO currency code list.