Bulk and Spectral Observables in Lattice QCD

We review recent developments in lattice siumulations of the equation of state, order of the thermal phase transition and the determination of the pseudo-critical temperature in (2+1)-flavor QCD. Owing to the increasing computer power, new argothithms, and improved fermion formulations, studies of bulk QCD matter are approaching to the stage of precision science. We also review recent lattice studies on the spectral properties of heavy quarkoniums inside the quark-gluon plasma (QGP). Although they are still in an exploratory stage, interesting physics in relation to the strongly correlated QGP is being extracted.