  I review the recent progress in providing a statistical foundation for black
hole thermodynamics. In the context of string theory, one can now identify and
count quantum states associated with black holes. One can also compute the
analog of Hawking radiation (in a certain low energy regime) in a manifestly
unitary way. Both extremal and nonextremal black holes are considered,
including the Schwarzschild solution. Some implications of conjectured
non-perturbative string ``duality transformations'' for the description of
black hole states are also discussed.
