Judicial power is the authority vested in courts and judges. It is the authority to hear and decide cases and to make binding judgments on them.
Article three of U.S. Constitution provides that the judicial Power of the U.S. should be vested in one Supreme Court and in such inferior courts as the Congress may from time to time order and establish. [USCS Const. Art. III, § 1] Article three further provides that the judicial Power should extend to all cases, in law and equity, arising under the Constitution, the laws of the United States, and Treaties made, or which is made, under their Authority. [USCS Const. Art. III, § 2, Cl 1]