1. In the Parliamentary System of government, the Prime Minister is the head of the Executive, i.e. the Council of Ministers.
2. In the Presidential System of government, the President is the head of the Executive. ‘
3. Since India has adopted the Parliamentary system, we have the post of the Prime Minister.
4. Since United States of America has adopted Presidential System, they have the post of the President.
5. The post of the Prime Minister does not exist in Presidential System of government.