It is hard to overestimate the role that money plays in people's lives. In ancient times people used to exchange things. It was called a barter deal. But later money was created as a method of universal payment. The functions of money in accordance with economy are large in number. But practically we apply it as a means of payment for goods and services and as a means of estimation. In our mind prices for services and goods are even connected with the quality. It is reasonable that an inexpensive thing can't be of high quality. If to examine the situation from the standpoint of an ordinary person, existing in contemporary world with no money isn't possible. You need money to obtain meals, outwear, household chemistry, to pay for housing services. We do not even mention such things like gifts for your loved ones on various occasions, acquiring modern appliances and luxury goods. So the role of money is truly significant.
The form of money is different from state to state. The money in every country is called national currency. What is a common means of payment in one country is a foreign currency in another one. When you come to a foreign state having just your national currency, you need to exchange it to money applied as a means of payment in the state of your presence. At present time most world currencies can be quickly purchased and sold in practically every state in the world. In case the currency rate isn't stable people prefer to save money as this or that currency that differs from the currency of their own state.
Currency exchange services are useful not only for travellers, but for all the other people as well. The currency exchange rates rarely remain unchanged, they're often altered. So in case you purchase currency at one price and in a week you sell it at another price that is higher you can get a profit. This process is named speculation and it is the foundation of world-known Forex market. In case you not only rely on your luck, but examine the situation on financial market, you will easily understand how to make money on the changes of currency exchange rates.
