Add to ORKGWe know by now that neutrinos are massive and oscillating particles and the long standing solar neutrino puzzle has been solved, confirming the Solar Standard Model validity. These results and their phenomenological interpretation are discussed, focusing the attention on the complete phenomenological analysis developed by the Milano group. A new era started, in which the main purpose is not anymore to prove the existence of neutrino oscillations, but to determine with the greatest possible accuracy the mixing parameters. The perspectives of the main running and future experiments are discussed. The new generation of experiments, planned to improve the knowledge of neutrino physics, will probably enable us also to test some Standard Model pa...