The judicial branch finds out the meaning of laws, applies laws to individual cases, and decides if laws violate the Constitution.
The Supreme Court's landmark decision regarding judicial review is Marbury v. Madison, 5 U.S. 137 (1803).
Marbury v. Madison- Was a landmark United States Supreme Court case in which the Court formed the basis for the exercise of judicial review in the United States under Article III of the Constitution.
I believe this branch is the most powerful out of all the branches because they have the power to veto laws. The have control on the laws and can choose to keep or take away a law. The Judicial branch over views the laws and picks which one they like and can choose to veto it or keep. The world is nothing without laws and if you have control of the laws you kind of have power over the world. The president the most powerful person on the planet has to ask permission to be able to pass laws.