  The COHERENT collaboration measured coherent elastic neutrino-nucleus
scattering (CEvNS) for the first time at the Spallation Neutron Source at Oak
Ridge National Laboratory, using a CsI[Na] detector. Here we discuss the nature
of the CEvNS process, physics motivations, and experimental considerations for
measuring CEvNS. We describe the CsI[Na] measurement, along with status and
future of COHERENT.
