  The topics discussed in this lecture include: general properties of neutrinos
in the SM, the theory of neutrino masses and mixings (Dirac and Majorana),
neutrino oscillations both in vacuum and in matter, an overview of the
experimental evidence for neutrino masses and of the prospects in neutrino
oscillation physics. We also briefly review the relevance of neutrinos in
leptogenesis and in beyond-the-Standard-Model physics.
