Final answer:
Judicial review is the power of the courts to determine whether acts of Congress and the executive are in accord with the Constitution. It was established by the Supreme Court in the case of Marbury v. Madison in 1803.
Step-by-step explanation:
Judicial review is the power of the courts to determine whether acts of Congress and the executive are in accord with the Constitution. It is the power of the courts to look at actions taken by the other branches of government and determine whether they are constitutional. This power was established by the Supreme Court in the case of Marbury v. Madison in 1803. If the courts find an action to be unconstitutional, it becomes null and void.