Final answer:
Judicial review grants the judiciary the authority to determine the constitutionality of laws and actions of Congress and the Executive Branch.
Step-by-step explanation:
Judicial review is the power of the courts, as part of the system of checks and balances, to review and overturn laws or other actions of Congress and the Executive Branch based on their constitutionality. It allows the judiciary to determine if these actions are in line with the Constitution.
For example, if a law passed by Congress violates constitutional rights, the judiciary can declare it unconstitutional, and it becomes null and void. This power gives the judiciary its independent status as a branch of the national government.