A presidential republic is a form of government where a president serves as both the head of state and the head of government. In this system, the president is elected by the citizens and holds significant powers, including the ability to enforce laws, manage the executive branch, and represent the country in foreign affairs. This structure often includes a separation of powers among the executive, legislative, and judicial branches to prevent any one branch from becoming too powerful. In a presidential republic, the legislative body, often called a parliament or congress, is separate from the presidency. This means that the president cannot directly control the legislative process, which helps ensure checks and balances. Countries like the United States and Brazil are examples of presidential republics, where the president is elected independently of the legislative body, allowing for a distinct separation of powers.