Forex is short for foreign exchange - the transaction of changing one currency into another currency. This process can be performed for a variety of reasons including commercial, tourism and to enable international trade.
Forex is traded on the forex market, which is open to buy and sell currencies 24 hours a day, five days a week and is used by banks, businesses, investment firms, hedge funds and retail traders.
The forex market is by far the largest and most liquid financial market in the world, with an estimated average global daily turnover of more than US$6.5 trillion - which has risen from $5 trillion just a few years ago.
One critical feature of the forex market is that there is no central marketplace or exchange in a central location, as all trading is done electronically via computer networks. This is known as an over the counter (OTC) market.
While a lot of foreign exchange is done for practical purposes, the vast majority of currency conversion is undertaken with the aim of earning a profit. The amount of currency converted every day can make price movements of some currencies extremely volatile. It is this volatility that can make forex so attractive to traders: bringing about a greater chance of high profits, while also increasing the risk.