We review some aspects of weak decays of hadrons containing one heavy quark.
The main emphasis is on B physics, in particular in the framework of the
Heavy Quark Effective Theory.Comment: LaTex, 48 pages, 4 figures; uses psfig, sprocl.sty. To be published
in the Boris Ioffe Festschrift "At the Frontier of Particle Physics/ Handbook
of QCD", edited by M. Shifman, (World Scientific
