In Today's world no single country is self independent, they have to rely on others for different perspectives and these needs generate the international transaction. But all countries don't have same purchasing power, so their currency value against others is different. The need for exchange rate arises whenever a buying and selling or investing and borrowing transaction take place across the globe. Such rate indicates the value of one currency against the other one. Globally, operations in the foreign exchange market started in a major way after the breakdown of the Bretton Woods system in 1971, which also marked the beginning of floating exchange rate regimes in several countries. Over the years, the foreign exchange market has emerged as the largest market in the world. The decade of the 1990s witnessed a perceptible policy shift in many emerging markets towards reorientation of their financial markets in terms of new products and instruments, development of institutional and market infrastructure and realignment of regulatory structure consistent with the liberalised operational framework.