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Neutrinos are the most abundant massive particles in our Universe but its existence was only predicted 90 years ago. In fact they were not experimentally observed until 60 years ago due to their extraordinarily low cross-section and even nowadays many questions concerning these subatomic particles remain open, as their mass magnitude and ordering, their Dirac or Majorana nature or the possibility of CP-violation.The Standard Model of Particle Physics establishes that neutrinos are massless particles. Nevertheless in 2015, Takaaki Kajita and Arthur McDonald were awarded with the Nobel prize in Physics for the discovery of the phenomenon of neutrino flavour oscillations, only possible if neutrinos are massive, demonstrating that a neutrino of one particular flavour has non-zero probability to be detected with a different flavour. These oscillations are governed by six independent parameters: 3 mixing angles 12, 23 and 13, two mass squared differences and a CP phase responsible for the CP-violation in the leptonic sector, being this last parameter still unknown as well as the neutrino mass ordering...