2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/42875At first we introduce the Neutrino in the standard Model, then the Dirac and Majorana Masses. After introducing the See-Saw Mechanism, we discuss the neutrino oscillations and the neutrino in astrophysics and cosmology. We finish this paper with a brief summary of the neutrino experiments.35 pages; paper also available at http://www.slac.stanford.edu/spires/find/hep/www?irn=5513251High Energy Physics - Phenomenologytext