Section 2 of Article III describes the jurisdiction of the federal courts. Jurisdiction is the power of a court to hear a case, so this section tells us what kinds of cases the Supreme Court and other federal courts will hear. All cases that arise under the Constitution, the laws of the United States or its treaties.
Section 2: Judicial power, jurisdiction, and trial by jury. Section 2 delineates federal judicial power, and brings that power into execution by conferring original jurisdiction and also appellate jurisdiction upon the Supreme Court
