Express Mail is a fast shipping service offered by postal and courier companies, designed to deliver packages and documents quickly. It typically guarantees delivery within one to three business days, depending on the destination. This service is ideal for urgent shipments, such as important documents or time-sensitive items. The Express Mail service often includes features like tracking, insurance, and delivery confirmation. Customers can easily monitor their shipment's progress online, ensuring peace of mind. Many businesses and individuals rely on this service for its speed and reliability, making it a popular choice for both domestic and international shipping needs.