Dirac and Majorana CP-Violation

The phenomenology of 3-neutrino mixing and of the corresponding Dirac and Majorana CP-violation is briefly reviewed. The physics potential of the experiments, searching for (ββ)0ν-decay and having sensitivity to ||≳0.01 eV, for providing information, in particular, on the Majorana CP-violation phases in the PMNS neutrino mixing matrix is discussed. A phenomenological approach for understanding the pattern of neutrino mixing is also considered with emphasis on the CP-violating case.