The EU Customs Union is a trade agreement among the member states of the European Union that allows for the free movement of goods without customs duties or tariffs. It establishes a common external tariff, meaning that all member countries apply the same import duties on goods coming from outside the union. This simplifies trade and reduces costs for businesses operating within the EU. Additionally, the Customs Union helps to ensure that goods meet certain safety and quality standards, promoting consumer protection. By working together, member states can streamline customs procedures and enhance economic cooperation, ultimately benefiting both businesses and consumers across the EU.