I review recent developements in lattice QCD at finite temperature, including
the determination of the transition temperature T_c, equation of state and
diffenet static screening lengths. The lattice data suggest that at
temperatures above 1.5T_c the quark gluon plasma can be considered as gas
consisting of quarks and gluons.Comment: Talk presented at 23rd Winter Workshop on Nuclear Dynamics, Latex, 8
pages, 5 figures, uses bigsky2007.sty. Typos corrected, further discussion of
Tc is adde
