  The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory provides
an intense, high-quality source of neutrinos from pion decay at rest. This
source was recently used for the first measurements of coherent elastic
neutrino-nucleus scattering (CEvNS) by the COHERENT collaboration, resulting in
new constraints of beyond-the-standard-model physics. The SNS neutrino source
will enable further CEvNS measurements, exploration of inelastic
neutrino-nucleus interactions of particular relevance for understanding of
supernova neutrinos, and searches for accelerator-produced sub-GeV dark matter.
Taking advantage of this unique facility, COHERENT's suite of detectors in
"Neutrino Alley'' at the SNS is accumulating more data to address a broad
physics program at the intersection of particle physics, nuclear physics, and
astrophysics. This review describes COHERENT's first two CEvNS measurements,
their interpretation, and the potential of a future physics program at the SNS.
