Foreign Exchange (Forex) has been very popular from many days. There are many people who are earning lots and lots of money from Forex. All you have to do is open an account at some website and start trading. You will be buying the money in one currency and selling them in another currency. So a small change in the currency rate can bring you a lot of money. If the currency rate falls then you will make a big loss. SO you have to be very careful. It is an operation round the clock. U.S. dollar, Euro Dollar, British Pound, Japanese Yen, Swiss Franc, Australian Dollar and the Canadian Dollar are the major currencies in Forex. There are many sites which will help you to learn about forex. A quick google search will give you a lot of companies.