Foreign Exchange which is usually known as "Forex" or "FX". It is the largest, most liquid and exciting financial market in the world. The foreign exchange market looks absolutely ginormous with its $7.5 TRILLION a day trade volume.
Foreign exchange or currency trading is the exchange of money from different countries. The value of one country's currency is constantly changing against the value of another country's currency. Forex traders make money through buying and selling currencies on the foreign exchange market.
Forex has no centralized exchange and is traded primarily through banks, brokers, dealers, financial institutions and private individuals. Due to this ability for financial institutions to trade Forex, the Forex market is open 24 hours, 5 days a week (closes Saturday and Sunday). Forex trading begins each business day in Sydney, then Tokyo, then London, and then New York. Please see FAQ and Download Trading Terminal.