A great introductory article on Taxonomies

Liz Edols has written a great introductory article on what exactly are Taxonomies?

...'structures that provide a way of classifying things - living organisms, products, books - into a series of hierarchical groups to make them easier to identify, study, or locate. Taxonomies consist of two parts - structures and applications. Structures consist of the categories (or terms) themselves and the relationships that link them together. Applications are the navigation tools available to help users find information.'

- A cited Reference from Jean Graef's, Managing taxonomies strategically.