A Presidential System is a form of government where a president serves as the head of state and government, distinct from the legislative branch. This system allows for a clear separation of powers, ensuring that the executive, legislative, and judicial branches operate independently. Countries like United States and Brazil exemplify this structure, where the president is elected separately from the legislature. In a Presidential System, the president has significant authority, including the power to veto legislation and appoint government officials. This system can promote stability and decisiveness in governance, but it may also lead to conflicts between the president and the legislature, impacting the overall effectiveness of the government.