Constitution is the foundational law of a country which ordains the fundamental principles on which the government (or the governance) of that country is based. It lays down the framework and principal functions of various organs of the government as well as the modalities of interaction between the government and its citizens. With the exception of the United Kingdom (U.K.), almost all democratic countries possess a written constitution. India also possesses an elaborate written constitution which was enacted by a constituent assembly specifically set up for the purpose.
Our present constitution— the first Constitution of India framed and given to themselves by the people of India was adopted by the Constituent Assembly on 26 November, 1949. It came into full operation with effect from 26 January, 1950. The Constitution as originally adopted had 22 parts, 395 articles and 8 schedules. Its present text is as amended from time to time.
Although the systems of ancient India do have their reflections in the Constitution of India, the direct sources of the Constitution lie in the administrative and legislative developments of the British period. A concise and chronological description of the Acts, documents and events that culminated in the framing of the world's largest written Constitution is given here.