  We review basic aspects of the phenomenology of CP violation in the decays of
$K$ and $B$ mesons. In particular we discuss the commonly used classification
of CP violation -- CP violation in the mass matrix, in the interference of
mixing with decay, and in the decay amplitude itself -- and the related notions
of direct and indirect CP violation. These concepts are illustrated with
explicit examples. We also emphasize the highlights of this field including the
clean observables $B(K_L\to\pi^0\nu\bar\nu)$ and ${\cal A}_{CP}(B\to J/\Psi
K_S)$. The latter quantity serves to demonstrate the general features of large,
mixing induced CP violation in $B$ decays.
