1.

A service description captures the functional and non-functional characteristics of a service in a processable format. Learn more in: Cloud Service Brokerage: A Conceptual Ontology-Based Service Description Framework

2.

Is responsible for describing a service and the type of context information in a comprehensive, unambiguous manner that is machine interpretable to facilitate automation and human readable to facilitate rapid formulation by users (Sen, 2005). Learn more in: Context-Aware Service Discovery in Ubiquitous Computing

3.

A definition of what a service provides and how it is accessed and used. A service description includes descriptions of the functional and nonfunctional properties of the service, service interfaces, and the legal and technical constraints or rules for its usage. Learn more in: Service Description Ontologies

4.

A representation of the service operations, features, and non-functional properties. Learn more in: Cloud Services Publication and Discovery