usps certified overnight

usps certified overnight refers to a specific USPS service called Priority Mail Express, which offers guaranteed overnight delivery to most U.S. locations. USPS Priority Mail Express includes features such as tracking, delivery confirmation, and the option for insurance. It is often used for urgent or time-sensitive shipments, such as legal documents, medical supplies, or important contracts. Certified services add an extra level of security and verification, ensuring that the recipient confirms receipt of the item.