  These proceedings review the two DUNE prototype detectors, namely Single- and
Dual-Phase ProtoDUNEs. The detectors, both employing liquid argon Time
Projection Chambers (LAr TPCs), are currently being built at CERN as part of
the ProtoDUNE experimental programme. Such R&D programme aims at validating the
prototypes design and technology, which will eventually be applied to the DUNE
Far Detector at the Sanford Underground Research Facility (SURF).
