what is black hole definaution

A black hole is a mathematically defined region of spacetime exhibiting such a strong gravitational pull that no particle or electromagnetic radiation can escape from it.
Or,
A black hole is defined by the escape velocity that would have to be attained to escape from the gravitational pull exerted upon an object. For example, the escape velocity of earth is equal to 11 km/s. Anything that wants to escape earth's gravitational pull must go at least 11 km/s, no matter what the thing is — a rocket ship or a baseball. The escape velocity of an object depends on how compact it is; that is, the ratio of its mass to radius. A black hole is an object so compact that, within a certain distance of it, even the speed of light is not fast enough to escape.

A black hole is a place in space where gravity pulls so much that even light can not get out.... Called the black hole

Black hole isa region of space having a gravitational field so intense that no matter or radiation can escape

When a star m`s energy will finish then that will be changed in black hole ....IAnd one thing in black hole there will be mMore gravitational force s and u r saying write that the light can not get out ...It`s black Hole....