FOREX (FOReign EXchange market) is an international foreign exchange market, where money is sold and bought freely. The price of the money depends on supply and demand. Market is open 24 hours a day from 00:00 GMT on Monday to 10:00 pm GMT on Friday.
The major currencies traded in FOREX, are Euro (EUR), Japanese yen (JPY), British Pound (GBP), Canadian dollar (CAD), and Swiss Franc (CHF). All of them are traded against the US dollar (USD).
Everyday fluctuations of currencies constitute about 50 to 150 pips. It gives the best opportunity for traders to make money on these changes.
FOREX allows traders to sell and buy the currency in different orders. You may sell some currency even if you don’t have it. One standard position is called as LOT and is equal to $100,000, but traders may invest only $1,000 to receives $100,000 as a credit to buy or to sell any currencies. This kind of borrowing is called Merging trading.

Nowdays Foreign Exchange Market (FOREX) is the most profitable sector for your investments.

Unlike other financial markets the Forex market has no physical location, like stock exchange, for example. It operates through the electronic network of banks, computer terminals or just by phone. The lack of physical exchange enables the Forex market to operate on a 24-hour basis, spanning from one zone to another across the major financial centers (Sydney, Tokyo, Hong Kong, Frankfurt, London, New York etc). In every financial center there are a lot of dealers, who buy and sell currencies 24 hours a day during the whole business week. Trading session starts in Far East, in New Zealand (Wellington), then Sydney, Tokyo, Hong Kong, Singapore, Moscow, Frankfurt-on-Maine, London and ends in New York and Los Angeles.