Judicial review is the doctrine under which legislative and executive actions are subject to review (and possible invalidation) by the judiciary. Specific courts with judicial review power must annul the acts of the state when it finds them incompatible with a higher authority (such as the terms of a written constitution). Judicial review is an example of the separation of powers in a modern governmental system (where the judiciary is one of three branches of government). This principle is interpreted differently in different jurisdictions, which also have differing views on the different hierarchy of governmental norms. As a result, the procedure and scope of judicial review differs from country to country and state to state.

Judicial review is one of the main characteristics of government in the Republic of the United States and other democracies. It can be understood in the context of two distinct—but parallel—legal systems (civil law and common law), and also by two distinct theories on democracy and how a government should be set up (the ideas of legislative supremacy and separation of powers). First, two distinct legal systems, civil Law and common law, have different views about judicial review. Common-law judges are seen as sources of law, capable of creating new legal rules, and also capable of rejecting legal rules that are no longer valid. In the civil-law tradition judges are seen as those who apply the law, with no power to create (or destroy) legal rules.

The Constitution of India (Hindi: भारतीय संविधान; see also names in the other official languages) is the supreme law of India. It lays down the framework defining fundamental political principles, establishes the structure, procedures, powers, and duties of government institutions, and sets out fundamental rights, directive principles, and the duties of citizens. It is the longest written constitution of any sovereign country in the world, containing 444 articles in 24 parts, 12 schedules and 97 amendments. Besides the English version, there is an official Hindi translation. Bodhisattva Dr. Babasaheb Ambedkar[bhimrao ramji Ambedkar] is Chief Architect of Indian Constitution.

The Constitution was enacted by the Constituent Assembly on 26 November 1949, and came into effect on 26 January 1950. The date 26 January was chosen to commemorate the Purna Swaraj declaration of independence of 1930. With its adoption, the Union of India officially became the modern and contemporary Republic of India and it replaced the Government of India Act 1935 as the country's fundamental governing document. The Constitution declares India to be a sovereign, socialist, secular, democratic republic, assuring its citizens of justice, equality, and liberty, and endeavours to promote fraternity among them. The words "socialist" and "secular" were added to the definition in 1976 by constitutional amendment. India celebrates the adoption of the constitution on 26 January each year as Republic Day.