The international monetary system consists of rules and institutions that govern foreign exchange rates, trade, and capital flows between countries. It has evolved over four stages: the gold standard (1875-1914), the interwar period (1915-1944), the Bretton Woods system (1945-1972), and the floating exchange rate regime since 1973. Under the Bretton Woods system, currencies were pegged to the US dollar, which was convertible to gold, establishing a fixed exchange rate system. However, the system collapsed in 1971 when the US suspended gold convertibility, leading to the current floating rate regime.