Forex (Foreign Exchange) is the name given to the "direct access" trading of foreign currencies. With an average daily volume of $1.4 trillion, forex is 46 times larger than all the futures markets combined and, for that reason, is the world's most liquid market. In the past, forex trading was limited largely to enormous money center banks and other institutional traders. But in just the past few years, technological innovations and the development of online trading platforms allow small traders to take advantage of the significant benefits of trading foreign currencies with forex.
In contrast to the world's stock markets, foreign exchange is traded without the constraints of a central physical exchange. Transactions are instead conducted via telephone or online. With this transaction structure as its foundation, the Foreign Exchange Market has become by far the largest marketplace in the world.