Here's a breakdown:

* DNA is the genetic material found within the nucleus of cells.

* Chromatin is the complex of DNA and proteins that makes up chromosomes. It's essentially the "packaged" form of DNA.

* Chromosomes are the highly condensed, thread-like structures of chromatin that become visible during cell division.

So, the DNA in the nucleus exists as chromatin, which is then further organized into chromosomes when the cell prepares to divide.