a public service can best be described briefly as
Public service Public service[1][not in citation given] is a service which is provided by government to people living within its jurisdiction, either directly (through the public sector) or by financing provision of services. The term is associated with a social consensus (usually expressed through democratic elections) that certain services should be available to all, regardless of income, physical ability or mental acuity. Even where public services are neither publicly provided nor publicly financed, for social and political reasons they are usually subject to regulation going beyond that applying to most economic sectors. Public policy[2][not in citation given] when made in the public's interest and motivations can provide public services. Public service is also a course that can be studied at a college or university. Examples of public services are the fire brigade, police, air force, and paramedics.
United States Public Health Service The United States Public Health Service (PHS) is a division of the Department of Health and Human Services concerned with public health. It contains eight out of the department's eleven operating divisions. The Assistant Secretary for Health (ASH) oversees the PHS.  The Public Health Service Commissioned Corps (PHSCC) is the federal uniformed service of the PHS, and is one of the seven uniformed services of the United States.