What's the difference between a pulsar and a black hole?

>>7785450
>pulsar
Not a singularity.

>>7785450
one emits something, the other doesn't.

>>7785450
>rotating neutron star that emits a beam of electromagnetic radiation.
>neutron star
look up P-P chain and CNO cycle, the lifetime and form of a star depend on its mass.
Normally a star is prevented from compressing by its own gravity as long as the nuclear fission is going, the star is so boiled that gravity doesnt really compress the star itself, but if the fission runs long enough, such that it comes closer to iron which is stable. The star doesnt "boil" anymore and compress itself by its own gravity.
If it compress to the point where even electrons are pressed inside the nuclei, the proton and electron form neutron, meaning the whole star is neutron star.

I am no expert but i know black hole can have different size, i am not sure about such property for black hole but a neutron star doesnt necessarily have mass large enough for light to not escape.

As for radiation, both rotating black hole and neutron star emit radiation like pic related.