  This paper provides perspectives on recent progress in the understanding of
the physics of devices where the external magnetic field is applied
perpendicularly to the discharge current. This configuration generates a strong
electric field, which acts to accelerates ions. The many applications of this
set up include generation of thrust for spacecraft propulsion and the
separation of species in plasma mass separation devices. These ExB plasmas are
subject to plasma-wall interaction effects as well as various micro and macro
instabilities, and in many devices, we observe the emergence of anomalous
transport. This perspective presents the current understanding of the physics
of these phenomena, state-of-the-art computational results, identifies critical
questions, and suggests directions for future research
