In this textbook, the author Rodolfo Sacco, founder of a well-known school of Italian comparative law and president of the Latin Group of the International Academy of Comparative Law, explores what results a jurist can expect from comparative law. He demonstrates that comparison is the key to understanding one's own national norms, as it unexpectedly reveals the connections that exist between the legal text and its respective application. It uncovers a wealth of insights that otherwise remain hidden in the discourse between legislators, judges, and legal scholars. Additionally, comparison elucidates the fundamental significance and basic principles of legal models. These models continuously interact among different legal systems, thus becoming arbiters of all content and rules of legal orders.