http://en.wikipedia.org/wiki/Politics_of_IndiaAccording to its constitution, India is a "sovereign, socialist, secular, democratic republic." Like the United States, India has a federal form of government. However, the central government in India has greater power in relation to its states, and its central government is patterned after the British parliamentary system. On several occasions, "the Centre", the national government, has dismissed state governments and imposed President's rule on several states.
The government exercises its broad administrative powers in the name of the President, whose duties are largely ceremonial. The president and vice president are elected indirectly for 5-year terms by a special electoral college. Their terms are staggered, and the vice president does not automatically become president following the death or removal from office of the president.
Real national executive power is centered in the Council of Ministers (cabinet), led by the Prime Minister of India. The president appoints the prime minister, who is designated by legislators of the political party or coalition commanding a parliamentary majority. The president then appoints subordinate ministers on the advice of the prime minister.
India's bicameral parliament consists of the Rajya Sabha (Council of States) and the Lok Sabha (House of the People). The Council of Ministers is responsible to the Lok Sabha.
The legislatures of the states and union territories elect 233 members to the Rajya Sabha, and the president appoints another 12, who are experts in science or the arts. The elected members of the Rajya Sabha serve 6-year terms, with one-third up for election every 2 years. The Lok Sabha consists of 545 members; 543 are directly elected to 5-year terms. The other two are appointed by the President if he feels that the Anglo-Indian Community is underrepresented.
http://en.wikipedia.org/wiki/Prime_Minister_of_IndiaThe Prime Minister of India is, in practice, the most powerful person in the government of India. The Prime Minister is technically outranked by the President of India, but because the President's duties are largely ceremonial, the Prime Minister has effective responsibility for government.
India follows a parliamentary system of government, modelled after that of the United Kingdom to which it was formerly subject. In this system, the Prime Minister is generally the leader of a party (or coalition of parties) that can gain a majority in the lower house (Lok Sabha) of the Parliament of India.