The foreign exchange market is where currencies are traded. This international market’s most unique aspect is that it lacks a central marketplace. Instead, currency trading is conducted electronically over the counter (OTC). This means that all transactions occur via computer networks among traders worldwide rather than on one centralized exchange.
The market is open 24 hours a day, five and a half days a week. Currencies are traded worldwide in the major financial centers of Frankfurt, Hong Kong, London, New York, Paris, Singapore, Sydney, Tokyo, and Zurich—across almost every time zone. This means the forex market begins in Tokyo and Hong Kong when the U.S. trading day ends. The forex market can be highly active at any time, with price quotes changing constantly.