. Forex is the foreign exchange market, traded 00 hours a day, 0 days a week by banks, institutions, and individual traders. Learn more about the world's most traded market with a turnover of $0.0* trillion per day. Investing.com covers the latest forex news in the currency market and breaking financial news stories. 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 ... 