What is inside a black hole?

Hint: A black hole is a very dense astronomical body which has an extremely strong gravitational pull such that no object can ever escape its pull, not even light. It has a very high density as it contains a tremendous amount of matter enclosed in a tiny space.

Complete answer:
A black hole is an astronomical body which has such a strong gravitational pull that nothing; not even particles or light can escape it.
It has a very high density, we can say that it contains a tremendous amount of matter crammed in a relatively infinitesimally small space which results in a very strong gravitational pull from which even light is unable to escape and therefore we have no information or insight about what’s inside a black hole.
When objects or bodies are drawn into a black hole, they undergo spaghettification. In this process, the object gets compressed horizontally and stretched vertically on the action of a strong gravitational pull. Scientists predict that according to the physical forces, objects would be destroyed not just down to the atoms but to our energy and become a part of the black hole’s matter or a black hole can be a wormhole but that is only theoretically possible.
Therefore, the gravitational pull of a black hole is so strong that its impossible to know what happens inside it.

Note:
The escape velocity for a black hole far exceeds the speed of light. Black hole can also be described as a spacetime. A spacetime is a mathematical model in which three dimensional space fuses with the dimension of time to create a four-dimensional space. The gravitational pull is directly proportional to the mass.