Here's a breakdown of the concept:

* Taxonomy: The science of classifying organisms into groups based on shared characteristics. This involves naming, defining, and arranging organisms into a hierarchical system.

* Taxonomic Hierarchy: This is the system used in taxonomy, with increasingly specific levels of classification:

* Domain (e.g., Bacteria, Archaea, Eukarya)

* Kingdom (e.g., Animalia, Plantae)

* Phylum (e.g., Chordata, Arthropoda)

* Class (e.g., Mammalia, Insecta)

* Order (e.g., Primates, Coleoptera)

* Family (e.g., Hominidae, Carabidae)

* Genus (e.g., *Homo*, *Carabus*)

* Species (e.g., *Homo sapiens*, *Carabus auratus*)

So, a group of organisms at any level within this hierarchy is a taxon.