This document outlines Robert Whittaker's five-kingdom system of classification, including Monera, Protista, Fungi, Plantae, and Animalia. It provides brief definitions and examples for each kingdom. Monera contains unicellular organisms without nuclei, such as bacteria. Protista are unicellular organisms with nuclei or simple multicellular organisms, like amoeba. Fungi are heterotrophic unicellular or multicellular organisms that do not have locomotion, exemplified by mushrooms. Plantae are autotrophic multicellular organisms lacking locomotion, like plants. Animalia consists of heterotrophic multicellular organisms with locomotion, such as dogs.