The FOREX or Foreign Exchange market is the largest financial market in the world, with an volume of more than $1.5 trillion daily, dealing in currencies. Unlike other financial markets, the Forex market has no physical location, no central exchange. It operates through an electronic network of banks, corporations and individuals trading one currency for another. The lack of a physical exchange enables the Forex market to operate on a 24-hour basis, spanning from one zone to another across the major financial centers.

Traditionally, investors' only means of gaining access to the foreign exchange market was through banks that transacted large amounts of currencies for commercial and investment purposes. Trading volume has increased rapidly over time, especially after exchange rates were allowed to float freely in 1971.