Borexino is a low background liquid-scintillator detector acquiring solar neutrino data at the LNGS underground laboratory in Italy. Borexino is the only experiment capable to perform spectrally resolved measurements of the low-energy ⁷Be solar neutrinos. Using three years of data since the start of data taking in 2007, Borexino has performed the first direct measurement of the ⁷Be solar neutrino rate with accuracy better than 5%. The absence of day-night asymmetry of the ⁷Be solar neutrino rate was measured with a total uncertainty of 1%. Borexino results alone reject the LOW region of solar neutrino oscillation parameters at more than 8.5σ CL. Combined with the other solar neutrino data, Borexino measurements isolate the MSW-LMA solution of neutrino oscillations without assuming CPT invariance in the neutrino sector.