Why is a diplomatic courier service used?

A diplomatic courier service is used to securely transport sensitive government documents, materials, and communications between embassies, consulates, and foreign offices. This service ensures the confidentiality and integrity of diplomatic communications, as couriers are granted special protections and privileges under international law. The use of couriers helps facilitate smooth diplomatic relations by ensuring timely and secure delivery of important information. Additionally, it minimizes the risk of interception or tampering that could occur with conventional mail services.