What are nontariff barriers to international trade?

"Governments also use other tools besides tariffs to restrict trade. One type of nontariff barrier is the import quota, or limits on the quantity of a certain good that can be imported. The goal of setting quotas is to limit imports to the specific amount of a given product. The United States protects its shrinking textile industry with quotas. A complete list of the commodities and products subject to import quotas is available on line at the U.S. Customs and Border Protection Agency website. A complete ban against importing or exporting a product is an embargo. Often embargoes are set up for defense purposes. For instance, the United States does not allow various high-tech products, such as"