This document defines key terms related to international business such as globalization, which refers to interdependent relationships among people from different parts of the world divided into nations, and international business, which involves commercial transactions between two or more countries. It also discusses reasons why firms engage in international business such as expanding sales and acquiring resources. Several theories of international business are presented, including comparative advantage and product life cycle theory. Modes of operation and types of international organizations are defined. Constraints and opportunities for international business in various regions are outlined.