  Recent developments in finite-temperature studies of lattice QCD are
reviewed. Topics include (i) tests of improved actions for the pure gauge
system, (ii) scaling study of the two-flavor chiral transition and restoration
of $U_A(1)$ symmetry with the Kogut-Susskind quark action, (iii) present
understanding of the finite-temperature phase structure for the Wilson quark
action. New results for finite-density QCD are briefly discussed.
