The United States Postal Service (USPS; also known as the Post Office, U.S. Mail, or Postal Service) is an independent agency of the executive branch of the United States federal government responsible for providing postal service in the United States, including its insular areas and associated states.It is one of the few government agencies explicitly authorized by …

The words "Neither snow nor rain nor heat nor gloom of night stays these couriers from the swift completion of their appointed rounds" have long been associated with the American postal worker.Though not an official creed or motto of the United States Postal Service, the Postal Service acknowledges it as an informal motto along with Charles W. Eliot's poem "The Letter".