The official currency of the United States is the United States dollar, symbolized as USD or $. The dollar is subdivided into 100 cents and has been the primary medium of exchange in the U.S. since its establishment in the late 18th century. The coinage and paper currency feature portraits of historical figures such as George Washington, Abraham Lincoln, and Benjamin Franklin. The dollar serves not only as a domestic currency but also as a major global reserve currency, widely used in international trade and finance. The stability and influence of the U.S. economy contribute to the dollar's significance worldwide.