What is the relationship among phylum, class and order?

A division of order sharing a more specific common attribute. For example, there is a Family of frogs called "Ranidae" More specifically the definition of an order is.

In biology, a phylum is a level of classification or taxonomic rank below Kingdom and above Class. Traditionally, in botany the term division has been used instead of phylum, although the International Code of Nomenclature for algae, fungi, and plants accepts the terms as equivalent.