The Forex market is an international exchange for currencies. With an average daily turnover of almost $4 trillion, it is by far the world’s biggest market. The Forex market does not have a central marketplace responsible for processing trades, so the value of a currency can vary dramatically depending on banks and locations. A trader speculates on future Currency levels or price forecasts between currency pairs. Forex trading is very volatile and carries the potential risk of sizable losses. Here’s a list of the most common pairs.