  Most phenomenologically acceptable supersymmetric models imply breaking of
supersymmetry in a separate sector of fields introduced just for this purpose.
Supersymmetry breaking is transferred to the Standard Model due to a certain
interaction with this additional sector. In this review we disuss one of the
popular mechanisms of such mediation with the key role played by the Standard
Model gauge interactions. We consider general principles of gauge mediation and
give the critical analysis of specific models together with their
phenomenological and cosmological implications. We present also basic facts
concerning mechanisms of dynamical supersymmetry breaking.
