Neutrino Oscillations and New Physics

I discuss the theoretical background and the status of neutrino oscillation parameters from the current worlds' global data sample and latest flux calculations. I give their allowed ranges, best fit values and discuss the small parameters α≡ΔmSOL2/ΔmATM2 and sin2θ13, which characterize CP violation in neutrino oscillations. I mention the significance of ββ0ν (neutrinoless double beta decay) and current expectations in view of oscillation results.