Here's why:

* Prokaryotic cells are simple, single-celled organisms that lack a membrane-bound nucleus. Their genetic material (DNA) is located in a region called the nucleoid, which is not enclosed by a membrane.

* Eukaryotic cells, on the other hand, are more complex and have a true nucleus that contains their DNA.

Let me know if you'd like to learn more about prokaryotic or eukaryotic cells!