Page "Stellar black hole" Paragraph 2
from
Wikipedia
The collapse of a star is a natural process that can produce a black hole.
It is inevitable at the end of the life of a star, when all stellar energy sources are exhausted.
If the mass of the collapsing part of the star is below a certain critical value, the end product is a compact star, either a white dwarf or a neutron star.
Both these stars have a maximum mass.
So if the collapsing star has a mass exceeding this limit, the collapse will continue forever ( catastrophic gravitational collapse ) and form a black hole.
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