  This review outlines our present experimental knowledge and theoretical
understanding of deep-inelastic scattering on nuclear targets. The emphasis is
primarily on nuclear coherence phenomena, such as shadowing, where the key
physics issue is the exploration of hadronic and quark-gluon fluctuations of a
high-energy virtual photon and their passage through the nuclear medium. New
developments in polarized deep-inelastic scattering on nuclei are also
discussed, and more conventional binding and Fermi motion effects are
summarized. The report closes with a brief outlook on vector meson
electroproduction, nuclear shadowing at very large Q^2 and the physics of high
parton densities in QCD.
