  We review the holographic approach to electromagnetic phenomena in large N
QCD. After a brief discussion of existing holographic models, we concentrate on
the improved holographic QCD model extended to include magnetically induced
phenomena. We explore the influence of magnetic fields on the QCD ground state,
focusing on (inverse) magnetic catalysis of chiral condensate, investigate the
phase diagram of the theory as a function of magnetic field, temperature and
quark chemical potential, and, finally discuss effects of magnetic fields on
the quark-anti-quark potential, shear viscosity, speed of sound and
magnetization.
