Final answer:
Judicial review is the ability of the Supreme Court to rule a law unconstitutional, established in the case of Marbury v. Madison. This power allows the court to check the other branches of government and ensure their actions are in line with the Constitution.
Step-by-step explanation:
Judicial review is the ability of the Supreme Court to rule a law unconstitutional. It is part of the court's power to check the other branches of government and ensure that their actions are in line with the Constitution.
This power was established in the landmark Supreme Court case Marbury v. Madison in 1803.
Judicial review allows the court to declare acts of the legislative and executive branches as unconstitutional, making them null and void.