The phenomena of meson-anti-meson flavour oscillation and CP violation are
known for several decades as properties in the neutral kaon system. Oscilla
tion in the neutral B meson system is known since 1987, and CP violation of
B mesons is still being searched for today. First results on one CP-violat
ing parameter in B-0 meson decays have become available recently. The prese
nt review introduces the phenomenology of both effects, their description w
ithin the Standard Model, and the presently available experimental results
on B mesons.