The arrangement of various taxa in a hierarchical order is called taxonomic hierarchy.

In this hierarchy, species is present at the lowest level whereas kingdom is present at the highest level.

Kingdom
↑
Phylum or division
↑
Class
↑
Order
↑
Family
↑
Genus
↑
Species

A Taxonomic hierarchy

Classification of a plant

As an example, let us classify Solanum melongena (Brinjal).

Kingdom – Plantae

Division – Angiospermae

Class – Dicotyledonae

Order – Solanales

Family – Solanaceae

Genus – Solanum

Species – melongena

Classification of an animal

As an example, let us classify Columba livia (Blue rock Dove).

Kingdom – Animalia

Phylum – Chordata

Class – Aves

Order – Columbiformes

Family – Columbidae

Genus – Columba

Species – livia