Customs services are government agencies that regulate and supervise the movement of goods and passengers across national borders in international trade.

The main purpose of customs services is to ensure that goods entering or leaving the country comply with legal regulations, collect taxes and duties, and maintain border security. Customs services also ensure compliance with trade agreements, prevent the entry of dangerous and prohibited products into the country, and ensure the transparency of trade transactions in general. Before accepting goods or passengers, customs services check their compliance, i.e. ensure that the goods are properly documented, monitor the payment of taxes and duties, and decide whether certain goods can enter the country.

These agencies also have the authority to resolve any disputes that arise during import and export processes and to approve customs declarations. The role of customs services also includes security checks and checking whether goods comply with customs declarations.

Customs officers monitor the movement of drugs, weapons and other dangerous substances in order to prevent the entry of prohibited goods into the country. In international trade relations, customs services ensure compliance with trade agreements, such as free trade zones or tax concessions. Customs services also ensure the safe and legal movement of goods between different countries.

They carry out extensive documentation and control procedures to ensure the correct and timely payment of customs duties and other payments. In addition, customs services carry out sanitary and phytosanitary inspections to protect the safety and health of goods at border crossings.

These services also check the suitability and quality of imported goods for the local market. With all these functions, customs services play an important role in protecting the country's economy, regulating trade activities and bringing transparency to international trade.