  ALICE is the CERN LHC experiment optimised for the study of the strongly
interacting matter produced in heavy-ion collisions and devoted to the
characterisation of the quark-gluon plasma. To achieve the physics program for
LHC Run 3, a major upgrade of the experimental apparatus is ongoing. A key
element of the upgrade is the substitution of the Inner Tracking System (ITS)
with a completely new silicon-based detector (ITS 2) whose features will allow
the reconstruction of rare physics channels not accessible with the previous
layout. The enabling technology for such a performance boost is the adoption of
custom-designed CMOS Monolithic Active Pixel Sensor as detecting elements. In
this proceedings, an overview of the adopted technologies as well as the status
of the detector commissioning will be given.
