  The theory and phenomenology of neutrinos will be addressed, especially that
relating to the observation of neutrino flavor transformations. The current
status and implications for future experiments will be discussed with special
emphasis on the experiments that will determine the neutrino mass ordering, the
dominant flavor content of the neutrino mass eigenstate with the smallest
electron neutrino content and the size of CP violation in the neutrino sector.
Beyond the neutrino Standard Model, the evidence for and a possible definitive
experiment to confirm or refute the existence of light sterile neutrinos will
be briefly discussed.
