The Prime Minister of India is the Head of the Union Government, as distinct from the President of India, who is the Head of State. Since India has parliamentary system of constitutional democracy, it is the Prime Minister who oversees the day-to-day functioning of the Union Government of India.
The Prime Minister of India serves as the leader of the federal government while the President of India functions as the head of state in a parliamentary system with a constitutional democracy. The Prime Minister oversees the operational aspects of the Union Government.