  In the presence of strong magnetic field reported to have been observed on
the surface of some neutron stars and on what are called Magnetars, a host of
physical phenomenon from the birth of a neutron star to free streaming neutrino
cooling phase will be modified. In this review I will discuss the effect of
magnetic field on the equation of state of high density nuclear matter by
including the anomalous magnetic moment of the nucleons into consideration. I
would then go over to discuss the neutrino interaction processes in strong as
well as in weak magnetic fields. The neutrino processes are important in
studying the propagation of neutrinos and in studying the energy loss, Their
study is a prerequisite for the understanding of actual dynamics of supernova
explosion and on the stabilization of radial pulsation modes through the effect
on bulk viscosity. The anisotropy introduced in the neutrino emission and
through the modification of the shape of the neutrino sphere may explain the
observed pulsar kicks.
