The foreign exchange market (forex, FX, or currency market) is a global decentralized market for the trading of currencies. In terms of volume of trading, it is by far the largest market in the world.[1] The main participants in this market are the larger international banks. Financial centres around the world function as anchors of trading between a wide range of multiple types of buyers and sellers around the clock, with the exception of weekends. The foreign exchange market determines the relative values of different currencies. - Wikipedia