  The Standard Model has been effective way beyond expectations in foreseeing
the result of almost all the experimental tests done up so far. In it,
neutrinos are massless. Nonetheless, in recent years we have collected solid
proofs indicating little but non zero masses for the neutrinos (when contrasted
with those of the charged leptons). These masses permit neutrinos to change
their flavor and oscillate, indeed a unique treat. In these lectures, I discuss
the properties and the amazing potential of neutrinos in and beyond the
Standard Model.
