The term “density” typically refers to how much mass is distributed within a certain volume. In the case of a black hole, all of its mass is theoretically concentrated at a single point in the center, known as the singularity. This would imply an infinite density. 

However, if we consider the volume of a black hole to be the volume within its event horizon (the boundary beyond which nothing can escape), then the average density of a black hole can be finite and even surprisingly low for supermassive black holes.

For instance, the average density of a supermassive black hole is inversely proportional to the square of its mass. This means that supermassive black holes, which contain millions or billions of times the mass of our sun, can have an average density comparable to that of water.

It’s important to note that these concepts come from our current understanding of general relativity and quantum mechanics, and there are still many mysteries about black holes that scientists are trying to unravel.

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#### Sources:
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1. https://universe.nasa.gov/black-holes/basics/

2. https://www.forbes.com/sites/startswithabang/2019/10/12/ask-ethan-how-dense-is-a-black-hole/

3. https://chem.libretexts.org/Ancillary_Materials/Exemplars_and_Case_Studies/Exemplars/Physics_and_Astronomy/Density_of_Black_Holes

4. https://physics.stackexchange.com/questions/5888/how-can-super-massive-black-holes-have-a-lower-density-than-water
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