In economics and international trade in order to curb imports from other countries many governments imposes barriers. There are two types of barriers one is called tariff barrier, which involve imposing taxes on imported goods so as to make them expensive as compared to domestic goods. This is the prime weapon which is used by all governments across the world in order to curb the import of goods they want to curb.
The other barrier is called Non tariff barriers, it does not imposes direct taxes but these barriers try to reduce imports indirectly by using many measures, non tariff barriers can be put in many ways like restriction in terms of quantity which can be imported, strict quality norms, putting many conditions which are impossible to meet, obscure licensing requirement, import quota and so on.