International mail refers to the process of sending letters, packages, and other items across national borders. It involves postal services from different countries working together to ensure that mail reaches its destination safely and efficiently. Each country has its own regulations and procedures for handling international mail, which can affect delivery times and costs. When sending international mail, it is important to properly address the item and include any necessary customs forms. Items may be subject to customs duties or restrictions based on the destination country's laws. Services like DHL, FedEx, and UPS also offer international shipping options for faster delivery.