USPS stands for the United States Postal Service. It is an independent agency of the federal government of the United States responsible for providing postal service in the country. USPS was founded in 1775 and is one of the oldest and most widely used postal services in the world. It offers a wide range of services, including letter and package delivery, shipping and mailing supplies, PO box rentals, and various other services. USPS is also responsible for handling international mail and packages, as well as providing various online services such as tracking and delivery notifications.