Question

What is gravitational singularity

Answer 1

⛧ A gravitational singularity or spacetime singularity is a location in spacetimewhere the gravitational field of a celestial body becomes infinite in a way that does not depend on the coordinate system.
⛧ The quantities used to measure gravitational field strength are the scalar invariant curvatures of spacetime, which includes a measure of the density of matter. Since such quantities become infinite within the singularity, the laws of normal spacetime cannot exist.

Answer 2

A singularity means a point where some property is infinite. For example, at the center of a black hole, according to classical theory, the density is infinite (because a finite mass is compressed to a zero volume). Hence it is a singularity.