The significance of judicial review in government systems lies in its ability to uphold constitutional principles by reviewing the legality of legislative and executive actions. This process acts as a check on government power, ensuring that laws align with the constitution and protecting individual rights. Judicial review fosters a system of checks and balances, safeguarding against potential abuses of power. Its existence allows courts to interpret laws and adjust them according to evolving societal values, maintaining the integrity of the legal system.