When giant stars die in supernovas and their cores collapse with the protons and electrons essentially melting into each other to form neutrons, neutron stars would be created. Pulsars are types of neutron stars and the relics of massive stars. They are extremely magnetized and rotating at enormous spends. All pulsars are not neutron stars, because most of neutron stars have slowed down to not give off much rotational energy when neutron stars get old. Also, many pulsars are not spinning in a plane where we can spot
