This document provides information on tariff and non-tariff measures used to control international trade. It begins with an introduction to international trade and its effects. It then discusses the positives and negatives of trade barriers before explaining different types of tariff measures such as import tariffs and ad valorem tariffs. Non-tariff measures are also outlined, including import quotas, standards, and government procurement policies. The impacts of tariff and non-tariff barriers on supply and demand are illustrated using graphs. Finally, key differences between tariff and non-tariff measures are highlighted.