Constitutional law of india ii notes

What does Article 2 of the constitution mean?
Article II – The Executive Branch.
At the head of this branch is the nationally elected President of the United States.
The president swears an oath to 'faithfully execute' the responsibilities as president and to 'preserve, protect and defend the Constitution of the United States'..
Constitutional law establishes rules and procedures by which governments legislate, or make laws.
For example, the process for enacting new laws or amending existing laws, the method of amending the constitution and the number of terms or years a member of the legislative body may serve.

What does Article 2 of the constitution mean?