Reliability: Is the trading platform reliable enough for you to achieve the trading results you want? Being able to rely on the accuracy of prices quoted, the speed of data being transferred, and fast order execution is essential to being able to trade Forex successfully, particularly if you plan to use very short-term strategies like scalping. The information must be available in real time, and the platform must be available at all times when the Forex market is open. This ensures that you can take advantage of any opportunities that may present themselves.
Currencies are always traded in pairs, so the "value" of one of the currencies in that pair is relative to the value of the other. This determines how much of country A's currency country B can buy, and vice versa. Establishing this relationship (price) for the global markets is the main function of the foreign exchange market. This also greatly enhances liquidity in all other financial markets, which is key to overall stability.
Forex is a portmanteau of foreign currency and exchange. Foreign exchange is the process of changing one currency into another currency for a variety of reasons, usually for commerce, trading, or tourism. According to a recent triennial report from the Bank for International Settlements (a global bank for national central banks), the average was more than $5.1 trillion in daily forex trading volume.