Trading takes place in New York, Frankfurt, London, Tokyo and Sydney at all hours. Forex trading or foreign exchange currency trading involves selling one currency to buy another. Some of the most commonly traded currency pairs are USD-CHF (US Dollar / Swiss Franc), EUR-USD (Euro / US Dollar), USD-JPY (US Dollar / Japan Yen), and GBP-USD (British Pound / US Dollar). The main Trading centers of the forex currency market are New York, London, Frankfurt, Tokyo, and Sydney. They are located in different time zones. So, this makes the forex market trade 24 hours a day. There is no central exchange or location where the trading is conducted, and most trades are executed between two interested parties who use the phone or other electronic means to communicate. The main market for forex currency trading is the inter-bank market, in which banks, insurance companies, corporations and other large institutions trade to manage the risks associated with fluctuations in foreign exchange rates.