Neutron stars are simply compact objects that are created when the cores of massive stars collapse, and crush together every proton during supernova explosions. Neutron stars are objects of much fascination as they are relatively small but are denser than the sun.
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what is a neutron star
an extremely dense, compact star composed primarily of neutrons, especially the collapsed core of a supernova.
A neutron star is what is left over when a star collapses. These stars are very dense and rotate rapidly. There are several types of neutron star but they have some characteristics in common. You can find more information here: http://www.wisegeek.com/what-is-a-neutron-star.htm
A neutron star is actually a large star that has collapsed because it has run out of fuel, Neutron stars are only formed from collapsing stars that are at least 1.5 solar masses.