Judicial review is defined as the power to declare a government action unconstitutional and is one of the oldest and perhaps most important responsibilities of the judicial branch.
Judicial review refers to a nation's courts' capability to determine if the legislative, executive, and administrative departments of government are functioning in conformity with the constitution. Any activities considered to be in contravention of the Constitution are considered invalid and null. A written constitution is essential for the organization of legal challenge in this sense. Judicial review power of the courts basically restricts the executive of the country to act arbitrarily. Due to presence of judicial review the executive will not be allowed to pass any law with is not in accordance with the constitution.
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