International mailing systems

International mailing systems facilitate the delivery of mail and parcels across countries through organized networks managed by postal services and international agreements. They involve standardized procedures for sorting, customs clearance, and transportation, often using agencies like the Universal Postal Union (UPU) to coordinate between nations. Once a package is posted, it moves through various postal hubs, possibly crossing borders via air or land, until it reaches the destination country's postal service for final delivery. These systems ensure efficient, reliable cross-border communication and commerce while adhering to each country's regulations and customs requirements.