International Trade is the foundation of today's modern, business world. Countries and customers might be exposed to goods and services that are unavailable in their home country through international trade. The foundation of traditional theories of international trade was a multitude of presumptions about different characteristics, such as the structure of markets, technology, demand, and return on scale. Modern ideas are based on reexamining and adjusting classical theories in response to shifting trade conditions. The Industrial Age gave rise to theories on the economic, political, and social significance of international trade. The expansion of globalisation depends on the expansion of international trade. Restrictions on international trade would prevent countries from accessing goods and services outside of their borders and would cost them dearly in lost trade earnings.