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In ITIL, there are six activities in the service value chain which represent the steps an organization takes in the creation of value:

• Plan
• Engage
• Design and Transition
• Obtain/Build
• Deliver and Support
• Improve

https://www.bmc.com/blogs/itil-service-value-chain/

The purpose of the service configuration management practice is to ensure that accurate and reliable information about the configuration of services, and the CIs that support them, is available when and where it is needed. This includes information on how CIs are configured and the relationships between them.

https://wiki.process-symphony.com.au/framework/lifecycle/process/service-configuration-management-itil-4/

The purpose of the improve value chain activity is to ensure continual improvement of products, services, and practices across all value chain activities and the four dimensions of service management.

https://wiki.process-symphony.com.au/framework/lifecycle/service-value-systemitil-4/#:~:text=The%20purpose%20of%20the%20improve,four%20dimensions%20of%20service%20management .

CIs are simply any component that needs to be managed in order to deliver an IT service. A server, a virtual server, or even the configuration of an application could be considered a CI, for example

https://www.bmc.com/blogs/itil-asset-configuration-management/#:~:text=among%20your%20CIs-,Configuration%20items%20(CIs),considered%20a%20CI%2C%20for%20example .