what is a Black hole ?

A black hole is a region in space where the pulling force of gravity is so strong that light is not able to escape. The strong gravity occurs because matter has been pressed into a tiny space. This compression can take place at the end of a star's life. Some black holes are a result of dying stars.

A region of space resulting from the collapse of a star; extremely high gravitational field.

a black hole is a mysterious object in space