Money is the most important and essential tool of modern economic life. One cannot imagine modern economic life without money. Barter economies or self-sufficient economies are the thing of past and historical significance. Money is the foundation stone of modern economic life. Money is the pivot around which all economic activities revolve. Money is important in all economies whether it is a socialist economy or a capitalist economy; or a backward economy or a rich economy. In the initial stages of exchange economy, commodities were exchanged with commodities. Such transactions were known as barter transactions. In this stage commodity was the form of money. However, under barter transactions there were difficulties relating to common measure of value, store of value, divisibility of goods etc. Therefore, in place of commodities gold and silver were used as money. But even this system could not continue for long because the available stock of gold and silver was not adequate to meet the demand for the quantity of money. Therefore, it was replaced by paper money where promissory notes arc used as money. Now, besides paper money, credit money is being used extensively such as credit cards etc. There are many functions of money such as medium of exchange, basis of store of value, common measure of value, standard of deferred payments etc. However, money as a medium of exchange is the most important function. Therefore, in general, by money we mean such commodities which are accepted as medium of exchange and which have legal sanction and general acceptability.