Question

what is black hole..... Plese ans in short
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Answer 1

A black hole is a region of spacetime exhibiting such strong gravitational effects that nothing—not even particles and electromagnetic radiation such as light—can escape from inside it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.

Answer 2

Black hole is a extremely large star that has died and because of its own gravity, the mass of star falls to a single point called "singularity" nd thn the gravity is so much even light cannot escape it. Because of this, a black area forms around the singularity called the "event horizon" which we are told about.