In this paper, the authors analyze the most important thesis of Kripke’s Naming and Necessity : those of a priori (and necessity) and a posteriori (and contingence), the rigid designator notion (and its criticism of the Fregean descriptivist theory of names) and his review of de dicto and de re metaphysical concepts. Then, we minimally define Kripke’s Realism notion and we rebuild the Kripkean ordinary realistic option. Finally, we criticize the Causal Reference Theory and its metaphysical implications.