Actually Forex is the market in which all currencies all over the world are being traded. This market is the largest market in the world, the most liquid market and per day approximately $1.9 trillion are being traded. All trade are conducted over the counter. And its market open 24 hours, and 5 days in a week, those currencies are traded worldwide, among the major financial centers of London, New York, Tokyo, Zürich, Frankfurt, Hong Kong, Singapore, Paris and Sydney.