  Thirty years ago, the suppression of charmonium production in heavy-ion
collisions was first proposed as an unambiguous signature for the formation of
a Quark-Gluon Plasma. Since then, experiments at fixed-target accelerators
(SPS) and hadronic colliders (RHIC, LHC) have investigated this observable and
discovered a wide range of effects, that have been related to the original
proposal but at the same time have also prompted a strong development in the
underlying theory concepts. In this contribution, I will review the main
achievements of this field, with emphasis on recent results obtained by LHC
experiments.
