+A **trade barrier** is a government-imposed restriction on the free exchange of goods and services between countries. Such measures, like a [Tariff](/wiki/tariff), aim to influence international commerce, often in support of domestic industries or as part of [Protectionism](/wiki/protectionism) policy.
+## See also
+- [Free Trade](/wiki/free_trade)
+- [Quota](/wiki/quota)
+- [Embargo](/wiki/embargo)