Neutron Star

When big stars collapse and in the process the outer layers of the star are blown off in a supernova, nature's most spectacular explosion. The remnant core, roughly twenty kilometers wide and densely packed with neutrons, is called a neutron star. The protons and electrons are crushed  to form neutrons and that results in birth of a neutron star.

Another important characteristic of neutron stars is the presence of very strong magnetic fields, upward of  1 Trillion gauss (Earth’s magnetic field is 0.5 gauss). However, the axis of the magnetic field is not aligned with the neutron star's rotation axis. The combination of this strong magnetic field and the rapid rotation of the neutron star produces extremely powerful electric fields, with electric potential in excess of 1 trillion volts.  

The pulses of high-energy radiation we see from a pulsar are due to a misalignment of the neutron star's rotation axis and its magnetic axis.

pulsar is a neutron star that emits beams of radiation that sweep through Earth's line of sight. Like a black hole, it is an endpoint to stellar evolution. So pulsars are rotating neutron star.

When a pulsar first forms, it has the most energy and fastest rotational speed. As it releases electromagnetic power through its beams, it gradually slows down. Within 10 to 100 million years, it slows to the point that its beams shut off and the pulsar becomes quiet.

Although all pulsars are neutron stars, not all neutron stars are pulsars, and not all pulsars shine in the same