The Foreign Exchange market, also
referred to as the "Forex" or "FX" market is the largest financial market
in the world, with a daily average turnover of well over US$1 trillion
-- 30 times larger than the combined volume of all
U.S.
equity markets.
"Foreign Exchange" is the simultaneous buying of one currency and selling of another. Currencies are traded in pairs, for example Euro/US Dollar (EUR/USD) or US Dollar/Japanese Yen (USD/JPY).
There are two reasons to buy and
sell currencies. About 5% of daily turnover is from companies and governments
that buy or sell products and services in a foreign country or must
convert profits made in foreign currencies into their domestic currency.
The other 95% is trading for profit, or speculation.