Foreign Exchange (forex or FX) is the trading of one currency for another. For example, one can swap the U.S. dollar for the euro. Foreign exchange transactions can take place on the foreign exchange market, also known as the Forex Market.The forex market is the largest, most liquid market in the world, with trillions of dollars changing hands every day. There is no centralized location, rather the forex market is an electronic network of banks, brokers, institutions, and individual traders (mostly trading through brokers or banks). The market determines the value, also known as an exchange rate, of the majority of currencies. Foreign exchange can be as simple as changing one currency for another at a local bank. It can also involve trading currency on the foreign exchange market. For example, a trader is betting a central bank will ease or tighten monetary policy and that one currency will strengthen versus the other. There will also be a price associated with each pair, such as 1.2569. If this price was associated with the USD/CAD pair it means that it costs 1.2569 CAD to buy one USD. If the price increases to 1.3336, then it now costs 1.3336 CAD to buy one USD. The USD has increased in value (CAD decrease) because it now costs more CAD to buy one USD.