There are four sets around the IT Service Management.
Planning to implement service management
creates the planning to implement ITIL inside an organization.
The Business perspective
investigates if the services are efficient on the business and control the cost/revenue for the services.
ICT infrastructure
deals more with technical issues. (ICT = Information and Communication Technology)
Application Management
addresses the complex subject of managing applications from the initial business need, through the Application Management lifecycle, up to and including retirement.