Forex trading is based largely on the exchange of currencies throughout the world, with an estimated daily trading volume of over 5 trillion dollars. The Forex is currently a worldwide, closed-end market. It is open all 24 hours a day, six days a week (Mondays through Fridays). Online brokers provide services to their customers that allow them to speculate in Forex and make trades in real-time. This allows investors to exchange currency based on their predictions of market direction.