Tariff:A tax or duty imposed on imported or exported goods, typically by a government as a source of revenue or to protect domestic industries from foreign competition.
Non-Tariff Barriers:Restrictions on trade that are not in the form of tariffs, such as quotas, regulations, or standards that make it difficult to import or export certain goods.
Ad Valorem Duty: A customs duty that is charged as a percentage of the value of the imported goods, rather than a fixed amount per unit.