The term used to describe the trading of the currencies of the various countries of the world is called foreign exchange, forex or just FX. More than 1.5 trillion USD worth trade activities are conducted in the worlds largest forex market. The forex trade is not conducted by a central exchange unlike stock trading. Telephone or electronic networks are used to connect the two counterparts all over the world to make a trade. Moreover the forex market offers several advantages over equities trading. For more information about forex trading, check out the link.