The Pierre Auger Observatory advances the study of ultra-high-energy cosmic rays through a hybrid system of surface and fluorescence detectors. This paper presents recent results, including refined spectrum measurements, anisotropy evidence, and new insights into cosmic-ray composition. Studies at energies beyond terrestrial accelerators reveal implications for particle physics. The AugerPrime upgrade will further enhance particle identification and extend the sensitivity to photons and neutrinos, broadening the Observatory’s capability to explore cosmic-ray sources and propagation, paving the way for new discoveries.