  Atomtronics is a relatively new subfield of atomic physics that aims to
realize the device behavior of electronic components in ultracold atom-optical
systems. The fact that these systems are coherent makes them particularly
interesting since, in addition to current, one can impart quantum states onto
the current carriers themselves or perhaps perform quantum computational
operations on them. After reviewing the fundamental ideas of this subfield, we
report on the theoretical and experimental progress made towards developing
externally-driven and closed loop devices. The functionality and potential
applications for these atom analogs to electronic and spintronic systems is
also discussed.
