The most important of tariff barriers is the customs duty imposed by the importing country. The trade barriers can be broadly divided into two broad groups: Tariff is a customs duty or a tax on products that move across borders.
Trade barriers are imposed not only on imports but also on exports. To protect the home industry and raise the cost of imported items. Tariff barriers are the tax or duty imposed on the goods which are traded to/from abroad.
However, they differ significantly in their application and impact.