Here's why:

* DNA is the genetic material of the cell and is housed within the nucleus. The nucleus is a membrane-bound organelle that acts as the control center of the cell.

* Cytoplasm is the gel-like substance that fills the cell and surrounds the nucleus. It contains various organelles like ribosomes, mitochondria, and the endoplasmic reticulum, but not DNA.

However, there are some exceptions:

* Prokaryotic cells: These cells lack a nucleus and have their DNA located in a region called the nucleoid, which is within the cytoplasm. However, the DNA is still not freely floating but is organized and associated with proteins.

* Mitochondria and chloroplasts: These organelles have their own DNA, called mitochondrial DNA (mtDNA) and chloroplast DNA (cpDNA) respectively. This DNA is located within the cytoplasm of these organelles but is enclosed within their own membranes.

So, while DNA is not found freely in the cytoplasm of eukaryotic cells, it can be found in the cytoplasm of prokaryotic cells and within the cytoplasm of organelles like mitochondria and chloroplasts.