  Weak decays of heavy flavor hadrons play a special role in our understanding
of physics of the Standard Model and beyond. The measured quantities, however,
result from a complicated interplay of weak and strong interactions. Weak
leptonic and semileptonic decays are reasonably well understood, whereas weak
hadronic decays present challenges to theory. In this talk, we review the
present status of exclusive weak decays of charm and bottom hadrons.
