Heavy Ion Physics with CMS

We present the capabilities of the CMS experiment to explore the heavy-ion physics program offered by the CERN Large Hadron Collider (LHC). The prime goal of this research is to test the fundamental theory of the strong interaction (QCD) in extreme conditions of temperature, density and parton momentum fraction by colliding nuclei at energies of $\sqrt{s_{_{NN}}}$ = 5.5 TeV. This presentation will give the overview of the potential of the CMS to carry out a full set of representative Pb-Pb measurements both in ''soft'' and ''hard'' regimes. Measurements include ``bulk'' observables -- charged hadron multiplicity, low $p_{\rm T}$ inclusive hadron identified spectra and elliptic flow -- which provide information on the collective properties of the system; as well as perturbative processes -- such as quarkonia, heavy-quarks, jets, $\gamma$-jet, and high $p_{\rm T}$ hadrons --- which yield "tomographic" information of the hottest and densest phases of the reaction.