Globalization has transformed the world economy, connecting nations through trade, investment, and technology. This unit explores the benefits of free trade, including specialization and comparative advantage, while also examining the challenges of economic integration and the rationale behind protectionist policies. The historical context of globalization is traced from ancient trade routes to modern international institutions. Economic theories supporting free trade are discussed, along with the complex interplay between globalization and protectionism in shaping today's global economic landscape.