The Communication Theory of Law raises, in its last part, legal pragmatics, that is, the theory of the application of law to reality, for which it conceives law as a decision and very particularly as a judicial decision. However, every decision requires a communicative act that must be materialized through linguistic expression (oral or written), so the art of speaking (or writing) is inherent to the function of the jurist (judges, lawyers, prosecutors, etc.). In this sense, the Communicational Theory of Law deals with the study of Rhetoric, starting, for this, from its definition to, later, propose and study which are the fundamental communicative acts and the various techniques that support them.