What article of the constitution outlines the executive branch?

Article Two of the United States Constitution establishes the executive branch of the federal government, which carries out and enforces federal laws. It includes the President, the Vice President, the Cabinet, executive departments, independent agencies, and other boards, commissions, and committees.

 Article II

Details:

The United States Constitution begins Article II (in Section 1), saying:  "The Executive Power shall be vested in a President of the United States of America."

Then, in Section 2, Article II of the Constitution goes on to lay out powers and composition of the Executive Branch, with statements like these:

"The President shall be Commander in Chief of the Army and Navy of the United States""He may require the Opinion, in writing, of the principal Officer in each of the executive Departments, upon any Subject relating to the Duties of their respective Offices""He shall have Power to grant Reprieves and Pardons for Offenses against the United States""He shall have Power, by and with the Advice and Consent of the Senate, to make Treaties, provided two thirds of the Senators present concur""He shall nominate, and by and with the Advice and Consent of the Senate, shall appoint Ambassadors, other public Ministers and Consuls, Judges of the supreme Court, and all other Officers of the United States, whose Appointments are not herein otherwise provided for, and which shall be established by Law"