I will discuss recent progress in lattice QCD calculations at non-zero temperature and density. I will define the chiral and deconfinement aspects of the transition to the new state of strongly interacting matter. I will present lattice results on QCD equation of state at zero and non- zero baryon density together with the fluctuations of conserved charges. The lattice results will be compared to weak coupling calculations at high temperature as well as with Hadron Resonance Gas at low temperatures. Finally new results on screening properties of the deconfined matter will be shown.
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