Question

What is a black whole why does it exist

Answer 1

If u mean black hole*
It’s a space where gravity pulls so much that even light can not get out. The gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying because no light can get out, people can’t see black holes. They are invisible.

Black holes of stellar mass form when very massive starts collapse at the end of their life cycle.

- info from NASA

Answer 2

Answer:

A black hole is a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.