We define the public sector as all the administrative bodies (institutions, corporations and offices) of the State. The fact that the agencies belong to the State means that they are public, i.e., they belong to all the citizens of the country. Through them, the State is responsible for executing its policies and laws and usually for providing basic and indispensable services to the country's inhabitants.
These bodies are financed by taxes, credits and the issuance of currency.
In each country the public sector has a different size and a different proportion of the private sector, but it usually accounts for a very large percentage of the country's economy.