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The head of state of the United States is called the President, who also serves the functions of chief executive and commander in chief of the armed forces. By current law, the U.S. president serves a four-year term and may only be re-elected once, as a result of the twenty-second amendment to the U.S. Constitution.
As the most powerful person in the United States, a democratic republic and currently the world's only superpower, the President is sometimes referred to as "the leader of the free world," though this designation was more common during the Cold War. In slang, the President of the United States is sometimes called by the acronym POTUS. The wife of the President traditionally serves as First Lady.
The office of president of the United States is one of the most powerful offices of its kind in the world. The president, the Constitution says, must "take care that the laws be faithfully executed." To carry out this responsibility, the president presides over the executive branch of the federal government — a vast organization numbering about 4 million people, including 1 million active-duty military personnel. In addition, the president has important legislative and judicial powers.