  In ultrarelativistic heavy ion collisions the produced high temperature, high
energy density state will cross different phases of the strongly interacting
matter. The original idea of quark-gluon plasma formation has been evolved and
the weakly interacting gaseous state of massless partons has been replaced by
the picture of strongly interacting massive constituent quarks. Experimental
results at SPS and RHIC supports this idea. We discuss the phases at LHC
energies.
