The difference between substantive and procedural laws lies in their focus and function. Substantive laws define the rights and duties of individuals and entities, covering issues such as contracts, criminal offenses, and property rights. On the other hand, procedural laws govern the processes by which legal cases are adjudicated, ensuring fairness and justice in legal proceedings. Together, these categories of law establish not only the rules of conduct but also the methods for enforcing those rules and administering justice.