  The compelling experimental evidences for oscillations of solar, atmospheric
and reactor neutrinos imply the existence of 3-neutrino mixing in vacuum. We
review the phenomenology of 3-neutrino mixing, and the current data on the
3-neutrino mixing parameters. The opened questions and the main goals of future
research in the field of neutrino mixing and oscillations are outlined. A
phenomenological approach for understanding the pattern of neutrino mixing as
an interplay between the mixing, arising from the charged lepton sector, and
bimaximal mixing, arising from a neutrino Majorana mass matrix, is considered
with emphasis on the CP-violating case. We comment also on planned future steps
in the experimental studies of neutrino mixing.
