Explanation
Incident management is typically closely aligned with the service desk, which is the single point of contact for all users communicating with IT. When a service is disrupted or fails to deliver the promised performance during normal service hours, it is essential to restore the service to normal operation as quickly as possible.
https://www.bmc.com/blogs/itil-v3-incident-management/

ITIL has defined four dimensions that collectively are critical to the effective and efficient delivery of value to customers and other stakeholders in the form of products and services. These dimensions are:
Organizations and People
Information and Technology
Partners and Suppliers
Value Streams and Processes
https://www.bmc.com/blogs/itil-four-dimensions-service-management/

Explanation
The ITIL SVS describes how all the components and activities of the organization work together as a system to enable value creation.
The SVS is made up of specific inputs, elements, and outputs relevant to service management. The key inputs to the SVS are opportunity and demand. The output of the SVS is value delivered by products and services.
Opportunity refers to options or possibilities to add value for stakeholders or otherwise improve the organization.
Demand refers to need or desire for products and services among internal and external consumers.
https://www.bmc.com/blogs/itil-service-value-system/