  B mesons are bound states of a b quark and a light anti-quark. While the
binding is provided by the strong interaction B mesons can only decay by the
weak interaction. Since the top quark mass is large, B mesons are the only
mesons containing quarks of the third generation and thus their decays provide
a unique opportunity to measure the Cabibbo-Kobayashi-Maskawa (CKM) matrix
elements V_{cb}, V_{ub}, V_{ts}, and V_{td} which describe the couplings of the
third generation of quarks to the lighter quarks.
  We review experimental results on masses, lifetimes and decays of B mesons.
These include measurements of the inclusive production of charmed and
non-charmed mesons and baryons, observations of semileptonic B decays,
B-\bar{B} mixing, B meson lifetimes, measurements of exclusive hadronic final
states with charmed mesons, the search for exclusive hadronic final states
without charmed mesons, the first observation of the decay B\to K^*\gamma which
is described by an electromagnetic penguin diagram and measurement of the
inclusive b\to s \gamma rate. The theoretical implications of these results
will be considered.
