From Libertarian Wiki

Protectionism is the economic policy of restraining trade between states, through methods such as tariffs on imported goods, restrictive quotas, and a variety of other government regulations designed to discourage imports, and prevent foreign take-over of native markets and companies. This policy is closely aligned with anti-globalization, and contrasts with free trade, where government barriers to trade and movement of capital are kept to a minimum. The term is mostly used in the context of economics, where protectionism refers to policies or doctrines which protect businesses and workers within a country by restricting or regulating trade with foreign nations.