united states postal service priority refers to USPS’s expedited shipping service that delivers in 1–3 business days. Priority Mail includes free tracking, $100 insurance, and flat rate options for predictable pricing. It is a popular choice for small businesses and individuals needing fast, reliable shipping within the U.S. Customers benefit from flexible packaging options, including regional rate and weight-based pricing. For time-sensitive deliveries, USPS Priority balances affordability with convenience.