ServiceNow contains a resource which provides the following: - A standard and shared set of service related definitions across ServiceNow products and platform that will enable and support true…

The Common Services Data Model (CSDM) unifies data definitions across ServiceNow products, offering a prescriptive approach for managing configuration data, services, and relationships in the CMDB to support consistent reporting and service management.

The Configuration Management Database (CMDB) is the repository for CI data, but CSDM is the model that provides the framework and standardization *within* the CMDB.

Information Technology Service Management (ITSM) is a suite of practices and processes, often enabled by ServiceNow, but it's not the specific resource that defines the data model itself.

Information Technology Infrastructure Library (ITIL) is a framework of best practices for IT service management, not a ServiceNow specific resource that provides a data model or CMDB framework.