The power of the Executive Branch is vested in the President of the United States, who also acts as head of state and Commander-in-Chief of the armed forces. The President is responsible for implementing and enforcing the laws written by Congress and, to that end, appoints the heads of the federal agencies, including the Cabinet. The Vice President is also part of the Executive Branch, ready to assume the Presidency should the need arise. The Cabinet and independent federal agencies are responsible for the day-to-day enforcement and administration of federal laws.
The president and vice president are elected to govern for 4 years. The 22nd amendment limits the president to two terms or no more than 10 years.
To be able to be vice president or President you need to be 35 years old, natural born citizen, and lived in the U.S. the last 14 years.