Solar neutrinos have been of extraordinary importance for the discovery of neutrino oscillations and allow to study directly the Sun's innermost core. The Borexino experiment, located in the Gran Sasso National Laboratory, is an ultra-pure liquid scintillator detector conceived for the real time spectroscopy of low energy solar neutrinos. We review Borexino's results and we discuss its upcoming future, since the precision era of solar neutrino measurements has just started.