Operate currency pairs anywhere and any time with Forex trading. Forex, also known as foreign exchange, FX or currency trading, is a decentralized global market where the entire world's currencies trade. The forex market is the largest, most liquid market in the world with an average daily trading volume exceeding five trillion. All the world's combined stock markets do not even come close to this. But what does that mean to you? Take a closer look at forex trading and you may find some exciting trading opportunities that are not available with other investments.