This document discusses the five kingdom classification system which divides all living organisms into five kingdoms - Monera, Protista, Fungi, Plantae, and Animalia - based on their cellular structure and mode of nutrition. The kingdoms are described in order: Monera contains single-celled prokaryotes like bacteria; Protista contains single and multi-celled eukaryotes including algae and protozoa; Fungi are multi-celled organisms that absorb nutrients; Plantae are multi-celled organisms that photosynthesize; and Animalia are multi-celled heterotrophs that consume other organisms. Examples are provided for the characteristics and members of each kingdom.