What is the job of the federal judiciary?

Answer 1

The original Constitutional "job" given to the Judiciary was merely to hear cases that arise under the Constitution and affect the federal government; this can be read about in Article 3 of the Constitution. The real power of the judiciary, and where it starts getting interesting, is in Marbury v. Madison where the concept of "Judicial Review" was outlined as a power that the US Supreme Court had. This power, simply stated, is that the US Supreme Court can review and declare that an act of Congress was incongruent with the US Constitution and thus unconstitutional.

Answer 2

the basic purpose of the judicial branch of government is to state the laws and judge if they are constitutional. for example if someone goes to court for assault, the judge would hear their side of the story and rule whether the criminal was justified in their crime or not. if they were justified and it was constitutional then the judge would rule from there based on the constitution.

Answer 3

The judicial branch interprets the laws.