  A thorough understanding of neutrino-nucleus interactions physics is crucial
to achieving precision goals in broader neutrino physics programs. The
complexity of nuclei comprising the detectors and limited understanding of
their weak response constitutes one of the biggest systematic uncertainties in
neutrino experiments - both at intermediate energies affecting the short- and
long-baseline neutrino programs as well as at lower energies affecting coherent
scattering neutrino programs. While electron and neutrino interactions are
different at the primary vertex, many underlying relevant physical processes in
the nucleus are the same in both cases, and electron scattering data collected
with precisely controlled kinematics, large statistics and high precision
allows one to constrain nuclear properties and specific interaction processes.
To this end, electron-nucleus scattering experiments provide vital
complementary information to test, assess and validate different nuclear models
and event generators intended to be used in neutrino experiments. In fact, for
many decades, the study of electron scattering off a nucleus has been used as a
tool to probe the properties of that nucleus and its electromagnetic response.
While previously existing electron scattering data provide important
information, new and proposed measurements are tied closely to what is required
for the neutrino program in terms of expanding kinematic reach, the addition of
relevant nuclei and information on the final states hadronic system.
