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NJL-type effective models represent a low-energy realization of QCD andincorporate pertinent aspects such as chiral symmetry and its spontaneousbreaking, the center symmetry in the heavy-quark limit as well as the axialanomaly. One such model, the Polyakov-quark-meson model for three light quarkflavors, is introduced in order to study the phase structure ofstrongly-interacting matter. With recent high-statistics lattice QCDsimulations of the finite-temperature equation of state, a detailed comparisonwith model results becomes accessible. Such comparisons allow to estimatevolume and truncation effects of quantities, obtained on the lattice andprovide possible lattice extrapolation procedures to finite chemical potentialwhich are important to locate a critical endpoint in the QCD phase diagram.

QCD Thermodynamics: Confronting the Polyakov-Quark-Meson Model with Lattice QCD