  In this work we review what we consider are, some of the most relevant
results of heavy-ion physics at the LHC. This paper is not intended to cover
all the many important results of the experiments, instead we present a brief
overview of the current status on the characterization of the hot and dense QCD
medium produced in the heavy-ion collisions. Recent exciting results which are
still under debate are discussed too, leading to intriguing questions like
whether we have a real or fake QGP formation in small systems.
