It cannot be expected that businesses across the world will always accept money from any place in any given time. To begin with taking any sort of money can become confusing. Different countries break up their money into different denominations from each other. Accepting any sort of money can become difficult to sort and handle. There is also the fact that the value of money is different from place to place. Perhaps one day, all of the money in the world will be in a unified system that knows no borders but until then, certain steps must be taken. Fortunately, trading currencies is fairly easy in most cases through forex.
The foreign exchange market is the closest thing to a global standard that is currently available to unify money from country to country. The exchange keeps tabs on the value of the money in different countries and allows goods to be traded freely between countries. Vacations are also made much simpler through forex trading. Although foreign money is often accepted in places that are known for their international tourism by some businesses, that is not the most accurate means of trade. By exchanging their native currency into that of the local area, a vacationer can ensure their ability to make purchases without trouble.
Without a system of trading currencies the entire global market would collapse. The key to having successful international trade is having some sort of universal system to compare the value of the money from place to place and exchange it appropriately. With no sort of exchange program there would be no way to import or export goods between governments, as there would be no way to pay for them. International tourism would also be impossible, as there would be no way for a visitor to pay for food, lodging, attractions and other pleasantries.
Currency trading is one of the most important things that civilization has developed. As we continue forward toward one solid global community, peace becomes more common between many nations. Until it finally happens completely the thing that holds us together as a unified human race is the need for products from other parts of the globe. The constant trade system is the most important step that has been taken yet. The exchange of currencies and constant surveillance of global markets in comparison to each other make it possible. Trading currencies makes the world continue to function in the successful manner which it does today.