This book deals with international finance and the role of the foreign exchange rates in our economies. It is constituted from twelve chapters, from the history of our monetary system to the balance of payments and from the exchange rates to multinational businesses and their management. The internationalization of business, the interdependence and conflicts among nations, the enormous capital mobility, the foreign exchange market that provides the payments and instruments for all these international transactions, the risk that is involved among markets, economies, and businesses all require studies, instruments, insurance policies, management, correct public policies, and empirical work on international financial transactions, cultures, and the different value systems, so a finance or political science (undergraduate or graduate) student, a professional, a trader, or any other individual interested in international business could be able to deal with all these conflicts, challenges, and adversities, which their trend is incremental.