a group of people that work together and allocate resources to maintain and support a service offering and make it available to users

the cooperation between a service provider and a user that allows a service offering to be utilized as intended 

the collection of information technology capabilities made available to users by an organization’s service providers organized into a hierarchy of service categories, services, and service offerings

an interface allowing users to explore aspects of an organization’s service catalog to view relevant service categories, services, and service offerings