Forex or "Foreign Exchange" is where the money of one nation is traded with another.

There is no central marketplace for currency exchange; trade is conducted over the counter. The forex market is open 24 hours a day, five days a week and currencies are traded worldwide among the major financial centers of London, New York, Tokyo, Zürich, Frankfurt, Hong Kong, Singapore, Paris and Sydney.

The forex is the largest market in the world in terms of the total cash value traded, and any person, firm or country may participate in this market.

The most important and popular pairs of exchange in the forex market are "Euro Dollar", and you will see this pairs in all forex display screens as "EUR/USD". There are also a lot of others pairs but sure not important and not famous as "EUR/USD" pairs, like:-

1. The British Pound, and you will see this pairs in all forex display screens as "GBP/USD".
   
   
2. The Japanese Yen, and you will see this pairs in all forex display screens as "USD/JPY".
   
   
3. The Swiss Franc, and you will see this pairs in all forex display screens as "USD/CHF".

Currency trading in the past was just for the banks, but today and after the new revolution electronic economy, online forex trading companies start to offer a lot of services to all traders around the world. Today if anyone have a computer and internet connection can easily start to trade currencies, but sure the experience and analysis is very important to success in forex game.