Magnetic Fields of Neutron Stars: an Overview

Observations indicate that magnetic fields on neutron stars span at least the range $10^{8-15}$ G, corresponding to a range of magnetic fluxes similar to that found in white dwarfs and main sequence stars. The observational evidence is discussed, as well as the possible origin of the field, and the associated phenomenology (``classical'', millisecond, and binary pulsars, ``magnetars'', etc.). Particular attention is given to physical processes potentially leading to magnetic field evolution.