A tariff is a fundamental tool of economic policy used by governments to control the flow of goods across borders. When a country applies a tariff to an imported product, the cost of that product increases for the company bringing it into the country. This extra cost is usually passed on to the consumer, making the imported item less competitive compared to locally produced alternatives. While tariffs generate revenue for the government, their primary modern purpose is often protectionism—shielding domestic businesses and workers from foreign competition. 2) Usage Patterns: The word is almost always used as a countable noun. It frequently follows verbs like 'impose,' 'levy,' 'introduce,' or 'implement' when a tax is being started. Conversely, when trade barriers are being reduced, verbs like 'reduce,' 'cut,' 'lower,' or 'abolish' are used. It is also common to see it paired with specific industries, such as 'steel tariffs' or 'agricultural tariffs.' 3) Common Contexts: You will most often encounter 'tariff' in news reports concerning international relations, global economics, and political campaigns. It is a central theme in discussions about 'trade wars,' where two countries repeatedly raise tariffs on each other's goods. In a more literal, everyday sense, the word can sometimes refer to a list of fixed prices for services, such as a 'mobile phone tariff' or an 'electricity tariff,' particularly in British English. 4) Similar Words Comparison: It is important to distinguish 'tariff' from a general 'tax.' While all tariffs are taxes, not all taxes are tariffs; a tariff is specifically tied to international trade. It also differs from a 'quota.' A quota limits the physical quantity of a good that can be imported, whereas a tariff increases the price of that good. Finally, it differs from 'customs,' which refers to the government agency or the physical area at a border where tariffs are collected and goods are inspected.