Final answer:
The president serves as the Chief Executive with control over the executive branch and as the Head of State by representing the nation symbolically and politically. The role entails authority in both domestic policy and foreign affairs, with a greater influence often found in the latter. The president also embodies national unity and upholds Constitutional values.
Step-by-step explanation:
As Chief Executive, the president has authority over the executive branch, as Head of State, the president acts as the symbolic and political representative of the nation. In the role of Chief Executive, the president oversees the execution of federal law, appoints cabinet members, and serves as the civilian head of the armed forces. The president sets domestic policies and initiates legislation, influences foreign policy, and, in some instances, unilaterally engages in international agreements through executive power, as the position has evolved to include more authority in foreign policy than domestic policy.
As Head of State, the president undertakes duties that are both practical and ceremonial, embodying the unity and integrity of the nation while engaging with foreign diplomats and ambassadors, demonstrating headship in national and international affairs. The presidency also includes being the supreme guardian of the Constitution, requiring the incumbent to act within its boundaries while serving the country. The office has been personalized and is associated with characteristics necessary for leadership, including public communication and political skill.