Judicial review is the power of the judiciary to examine the constitutionality of laws and executive actions. If any law or action violates constitutional provisions, the judiciary can declare it invalid. This power acts as a safeguard against misuse of authority by the legislature and executive. Judicial review ensures that all actions of the state remain within constitutional limits. It also protects fundamental rights of citizens by preventing arbitrary or unjust laws. Through judicial review, the judiciary reinforces constitutional supremacy and strengthens democratic governance.