 Here's the simplest way of thinking of it. In your junior high civics class, you learned about the three branches of government. You've got the legislative branch, which in our federal system is Congress, makes the laws. You've got the executive branch, headed by the president, enforces the laws where it's supposed to. And you've got the judicial branch that interprets the laws where people disagree about what it means. You've got to go to somebody who can say, yeah, this is what that means, and then you can move forward.