Procedural law deals with the processes and rules that govern how a legal case flows, including how evidence is presented and the steps to follow in a lawsuit. Substantive law defines the actual rights and duties of individuals and the elements required to prove a legal claim or defence. Substantive law involves the essence of the legal rules, while procedural law ensures that those rules are applied fairly and consistently. 

Key Point: This question clarifies the difference between substantive law, which defines legal rights and obligations, and procedural law, which outlines the methods to enforce those rights and obligations.