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International audienceThe Pierre Auger Observatory, in Argentina, is the present flagship experimentstudying ultrahigh-energy cosmic rays (UHECRs). Facing the challenge due to lowcosmic-ray flux at the highest energies, the Observatory has been taking data for morethan a decade, reaching an exposure of over 50 000 km2 sr yr. The combination of a largesurface detector array and fluorescence telescopes provides a substantial improvement inenergy calibration and extensive air shower measurements, resulting in data of unprecedentedquality. Moreover, the installation of a denser subarray has allowed extending thesensitivity to lower energies. Altogether, this contributes to provide important informationon key questions in the UHECR field in the energy range from 0.1 EeV up to 100EeV. A review of main results from the Pierre Auger Observatory is presented with a particularfocus on the energy spectrum measurements, the mass composition studies, thearrival directions analyses, the search for neutral cosmic messengers, and the investigationof high-energy hadronic interactions. Despite this large amount of valuable results,the understanding of the nature of UHECRs and of their origin remains an open sciencecase that the Auger collaboration is planning to address with the AugerPrime project toupgrade the Observatory

The Pierre Auger Observatory status and latest results