Currency trading in the international market allows to widen the specter of financial instruments, thus giving a possibility to get a profit, which is higher than the profits received from trading other actives. There appears a possibility to diversify investment portfolio in order to lower the risks. In the currency market there are permanent fluctuations of currency rates due to the changes in demand and supply of some concrete currency, which is the basis of the profit from the invested capital. Political, social, and economic factors of a certain country also influence the change of currency rates against other currencies (development tempo in comparison to that of other countries) - employment of the population, inflation, productivity, etc. The volume of the FOREX market is up to four trillions dollars a day, which is tens times more than the whole daily volume of trading on the USA markets of securities. Companies and governments, which buy and sell goods and services in some other country, do about 5 per cent of daily trading, or they have to convert the earned profit into their national currency. Speculators with the aim of getting profit do the rest 95 per cent of daily trading.