Question

what is black hole?? ​

Answer 1

an area in space that nothing, not even light, can escape from, because the force that pulls objects in space towards each other (gravity) is so strong there.

Answer 2

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.