The public sector includes ----

Public sectors include public goods and governmental services such as the military, law enforcement, infrastructure (public roads, bridges, tunnels, water supply, sewers, electrical grids, telecommunications, etc.), public transit, public education, along with health care and those working for the government itself, such as elected officials.

The public sector might provide services that a non - payer cannot be excluded from (such as street lighting), services which benefit all of society rather than just the individual who uses the service.