In the past twentyfive years, our understanding of neutrinos has radically changed thanks to the discovery of neutrino oscillations in 1998. Most importantly, we now know that neutrinos have masses and mix and this implies new physics beyond the Standard Model (BSM). In this talk, I will briefly review the current knowledge of neutrino properties. I will discuss the remaining open questions, specifically the nature of neutrinos, their masses and the mixing parameters, and how to answer them exploiting the present and upcoming rich experimental programme in laboratories and cosmology. I will then discuss the origin of neutrino masses in models BSM, with emphasis on dark sectors that extend the Standard Model at scales below the electroweak one.
Luca Vecchi