Administrative law is a branch of law that regulates the organization and operation of the public administration and the relations between the public administration and citizens. Its main objective is to establish rules and principles that determine how decisions are made, power is exercised and public resources are administered. Administrative law covers areas such as administrative procedure, control of the administration, State responsibility and public contracting. It also regulates the exercise of administrative authority and the rights and obligations to the administration of citizens. Administrative law is based on laws and regulations that vary from country to country, and aims to ensure the transparency, efficiency and legality of the actions of the administrative authorities, as well as to protect the rights of citizens in their relations with the public administration.