  The Pierre Auger Observatory has collected data for more than 15 years,
accumulating the world's largest exposure to ultrahigh energy cosmic rays
(UHECRs). The energy spectrum of the UHECRs has been measured up to $10^{20.2}$
eV, and their mass composition has been studied exploiting both the
fluorescence and surface detectors of the Observatory. The analysis of the
UHECRs arrival directions allowed us to measure their large-scale anisotropies
over more than three decades in energy. The searches for intermediate-scale
anisotropies are being performed with an exposure now reaching approximately
$100,000$ km$^2$sr yr. For the first time, the fluctuations in the number of
muons in inclined air showers above $4 \times 10^{18}$ eV have been obtained,
while more information in the energy range $10^{17.5}-10^{18.3}$ eV comes from
the direct measure of muons with the underground scintillators of the
Observatory. Moreover, we discuss the limits obtained on the fluxes of neutral
particles and the results of the searches for UHE neutrinos from transient
astrophysical sources. The new perspectives opened by the current results call
for an upgrade of the Observatory, whose main aim is the collection of new
information about the primary mass of the highest energy cosmic rays to
understand the origin of the observed flux suppression. The progress of the
upgrade of the Observatory, AugerPrime, is presented and discussed.
