  We consider novel unusual effects in superconductor-ferromagnet (S/F)
structures. In particular we analyze the triplet component (TC) of the
condensate generated in those systems.This component is odd in frequency and
even in the momentum, which makes it insensitive to non-magnetic impurities. If
the exchange field is not homogeneous in the system the triplet component is
not destroyed even by a strong exchange field and can penetrate the ferromagnet
over long distances. Some other effects considered here and caused by the
proximity effect are: enhancement of the Josephson current due to the presence
of the ferromagnet, induction of a magnetic moment in superconductors resulting
in a screening of the magnetic moment, formation of periodic magnetic
structures due to the influence of the superconductor, etc. We compare the
theoretical predictions with existing experiments.
