When the Supreme Court declares a law unconstitutional it is an example of what?

When the Supreme Court declares a law unconstitutional, it is an example of judicial review. This power allows the Court to evaluate the validity of laws in relation to the Constitution, ensuring that legislative and executive actions remain within constitutional boundaries. Judicial review is a fundamental aspect of the system of checks and balances in the U.S. government, enabling the judiciary to act as a safeguard against potential abuses of power.