  CP violation in $B$ decays is reviewed in the Standard Model (SM) and beyond
the SM. The present explanation of CP violation in terms of a phase in the
Cabibbo-Kobayashi-Maskawa (CKM) matrix can be tested through a variety of CP
asymmetries in neutral and charged $B$ decays. Usually, new mechanisms of CP
nonconservation enter via $B-\bar{B}$ mixing and violate SM constraints on the
CKM parameters in a few characteristic ways. Different models can be partially
distinguished by penguin-dominated $B$ decay rate measurements. In radiative
decays, large mixing-induced asymmetries may occur due to new contributions to
the decay amplitude.
