This document discusses trade barriers, including their meaning, classification, and reasons for implementation. It provides an overview of the different types of trade barriers, such as tariffs, quotas, import licensing, and subsidies. The document also outlines some of the economic, political, and social reasons why countries continue to use trade barriers, such as protecting domestic industries and providing government revenue. Both the positive impacts of trade barriers, like increased domestic employment, and negative impacts, such as higher costs for consumers and businesses, are presented at a high level.