The system of government in which the president acts as the head of state and the head of government is

The system of government in which the president acts as the head of state and the head of government is the presidential system. In this system, the president is elected by the people and exercises executive powers independently of the legislature. The president is responsible for implementing the laws, administering the government and making executive decisions. The presidential system is commonly used in countries like the United States, Mexico, Brazil, and Nigeria.