  Ultra High Energy Cosmic Rays are the most energetic particles directly
measured, reaching orders of magnitude above those attained in the LHC. The
Pierre Auger Observatory is shedding light onto the long-standing mysteries of
their nature and origin. The present paper briefly reviews the latest results:
the energy spectrum and mass composition of UHECR, limits on the fluxes of
photons and neutrinos, the study of anisotropies in the arrival directions of
UHECS, and finally the constraints on high energy hadronic models. The paper
will finish with the upgrade of the Observaotry: AugerPrime.
