Forex refers to the various currencies and currency derivatives are traded and the marketplace where they traded. There is no centralized location for forex market, it is an electronic network of banks, brokers, institutions and traders.
Forex market is the largest, most liquid market in the world. The forex market is open 24 hours a day, every day of the week, except for few public holidays. The forex market is open on some holidays on which stock markets are closed, though trading volume may be lower than usual on those days. The low capital requirements and the accessibility makes the forex trading very appealing for many traders. The combination of speculation, economic strength and growth, and interest rate differentials, drives the forex market.