The existence of neutrino oscillations was confirmed 25 years ago. Since that time, a lot of experiments have been performed with different sources of neutrinos and detection techniques. Now, we know the values of the neutrino mixing angles with quite good precision, yet there are still questions to be answered, such as the neutrino mass ordering, CP-violation in the neutrino sector, or the existence of sterile neutrinos. This article summarizes the current knowledge of neutrino oscillations and presents recent results from selected experiments as well as some perspectives for the future.