A black hole is a fascinating hypothetical concept and does not refer to a hole in the proper sense of the word.
A black hole is an object, a massive amount of energy in a tiny amount of space.
Very large stars, much more massive than the Sun, for instance, will likely end their existence by collapsing to a size of just a few miles in diameter.
The concentrated gravitational force of a black hole pulls in all matter within its reach.
All matter includes all atoms, subatomic particles, and electromagnetic waves, even light.
If you fell into a black hole, you would likely be crushed before you figured out what happened.