Superconductivity and ferromagnetism are long-range orders coming both from a spontaneous symmetry breaking: the U(1) symmetry for spin-singlet superconductivity, and the SU(2) one for ferromagnetism. Although they are traditionally considered antagonistic phenomena, experimental results have shown that their coexistence can be realized in uniform systems, like for instance in the heavy fermions metals UGe2 and URhGe, and the rutheno-cuprate compounds like GdSr2RuCu2O8. This Monograph provides an overview of the interaction mechanisms between these two orders, focusing in particular on the...