  The Standard Model has been incredibly successful in predicting the outcome
of almost all the experiments done up so far. In it, neutrinos are mass-less.
However, in recent years we have accumulated evidence pointing to tiny masses
for the neutrinos (as compared to the charged leptons). These masses allow
neutrinos to change their flavour and oscillate. In these lectures I review the
properties of neutrinos in and beyond the Standard Model.
