One of the main roles of a judge is to interpret and apply the law. When a case is brought to court, the judge listens to arguments from both sides and makes a decision based on the law and the facts presented. The judge's decision sets a legal precedent that can be used in future cases. Other roles of a judge include ensuring that legal procedures are followed, protecting the rights of all parties involved, and overseeing the trial process to ensure that it is fair and impartial.