Here's a breakdown:

* Eukaryotes: Organisms whose cells have a membrane-bound nucleus that contains their genetic material (DNA). They are generally more complex than prokaryotes and include animals, plants, fungi, and protists.

* Prokaryotes: Organisms whose cells lack a nucleus and other membrane-bound organelles. Their DNA is located in a region called the nucleoid, but it's not enclosed within a membrane. Examples include bacteria and archaea.