The GErmanium Detector Array (Gerda) experiment searched at Laboratori Nazionali del Gran Sasso of INFN for neutrinoless double beta (0νββ) decay of the 76Ge isotope. The experiment has used 44 kg of bare high-purity germanium detectors, acting simultaneously as source and detector, deployed into ultra-pure liquid argon. The last Gerda results lead the 0νββ decay field, reporting the highest sensitivity on the half-life of 0νββ decay, 1.8×1026 yr, and the lowest background index at the Q-value of the decay, of 5.2×10−4 cts/(keV·kg·yr). These achievements are the result of the careful selection of highly radiopure materials and of efficient background suppression techniques. The experimental setup, the active background reduction techniques and the final results of Gerda will be summarized
