We present a simple introduction to CP violation, stressing the importance of CP as a natural symmetry of the gauge interactions, and its origin in scalar couplings. In section 5, named CP against TCP" a particular treatment of the K system relates to the notion of explicit CP violation and stresses the importance of strong interaction phases, in close parallel to the sitation in B mesons. For the sake of comparison, some notions ab out Left-Right symmetrical mo dels are introduced; their contributions to other channels of CP violation are contrasted to those of the standard model.Présenté durant l'École d'été de Physique des Particules, Palaiseau, France, 16 - 20 Sep 1991. Références :CERN-TH-6394-92, C91-09-16.2info:eu-repo/semantics/publ...