Abstract: There are three types - three "flavors" of neutrinos: electron, muon and tau. Enormous progress in neutrino physics was related to the discoveries of flavor oscillations and flavor conversion of neutrinos in matter. These discoveries allowed us to detrmine the neutrino mass parameters and mixing and to elaborate neutrino "flavor optics". I will describe recent developments in the field which include measurements of the 1-3 mixing, searches for new (flavorless) neutrinos, attempts to understand the origins of neutrino mass. I will outline possible future progress in the field.