The United States dollar or American dollar (also abbreviated with the symbol $ or with its standard international alphabetic abbreviation USD) is the legal tender of the United States, its territories, and other countries. The dollar is the most important international reserve currency in the world and also the most used in international transactions. Its status as the world's benchmark currency has made it the official currency of several countries and the de facto currency in many others, which use its banknotes for current transactions or set a fixed exchange rate for their national currencies against the dollar. The monetary policy of the United States is managed by the Federal Reserve System, which acts as the central bank of the nation and is also responsible for issuing dollars. The ISO 4217 code for this currency is USD.
