The Constitution of India outlines the roles and responsibilities of the President of India, which include the following:

• The President is the head of state and acts as a symbol of unity and sovereignty of India.
• The President appoints the Prime Minister, who is the head of the government and provides advice on the appointment of other ministers and key officials.
• The President represents India in international relations, appoints ambassadors and high commissioners, and ratifies international treaties.
• The President is the Commander-in-Chief of the armed forces and has the power to declare war and make peace.
• The President has the power to grant pardons and reprieves, commute death sentences, and award medals and honors.

The duties, powers, and functions of the President differ from those of the Prime Minister in several key ways. Unlike the Prime Minister, the President is a non-partisan figure who is not affiliated with any political party. The President also has fewer day-to-day responsibilities than the Prime Minister, who is responsible for the day-to-day functioning of the government. The President, however, has important ceremonial and symbolic duties and plays a significant role in foreign affairs, defense, and law and order.