Abstract: In this article, the history of neutrinos has been briefly reviewed. The atmospheric neutrino anomaly and solar neutrino problem are introduced, and neutrino oscillations as a perfect solution to those problems are discussed in some detail. Finally, the importance of neutrino masses and the remaining unanswered questions in neutrino physics are emphasized.

Key words: Nobel Prize, neutrino oscillations, neutrino masses, lepton flavor mixing, new physics beyond the standard model