The foreign exchange market is where currencies are traded. Currencies are important because they enable purchase of goods and services locally and across borders. International currencies need to be exchanged to conduct foreign trade and business.
If you are living in the United States and want to buy cheese from France, then either you or the company from which you buy the cheese has to pay the French for the cheese in euros (EUR). This means that the U.S. importer would have to exchange the equivalent value of U.S. dollars (USD) into euros.
The same goes for traveling. A French tourist in Egypt can’t pay in euros to see the pyramids because it’s not the locally accepted currency. The tourist has to exchange the euros for the local currency, in this case the Egyptian pound, at the current exchange rate.
One unique aspect of this international market is that there is no central marketplace for foreign exchange. Rather, currency trading is conducted electronically over the counter (OTC), which means that all transactions occur via computer networks among traders around the world, rather than on one centralized exchange. The market is open 24 hours a day, five and a half days a week, and 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 that when the U.S. trading day ends, the forex market begins anew in Tokyo and Hong Kong. As such, the forex market can be extremely active any time of day, with price quotes changing constantly.