This article discusses different theories and policies related to international trade. It covers topics like why countries trade, models explaining how trade affects income distribution, factors influencing trade patterns, and the impact of trade on economic growth. It also delves into how trade policies are formulated, including the use of instruments like tariffs and quotas, international trade laws, and negotiations between countries. The authors explore the challenges of discriminatory trade practices, regional trade agreements, and the role of trade in promoting development. Additionally, the article touches on issues related to trade costs, trade facilitation, services trade, and the concept of globalization in the context of international trade.