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 service level reporting.✑ A CMDB framework across our products and platform that will enable and support multiple configuration strategies.
What resource do these statements describe?
The CSDM is the data framework that admins should follow when they set up ServiceNow products and applications. The standards for defining configuration items (CIs) and relationships between CIs in the CMDB ensure that your data resides in the appropriate CMDB tables. The result is maximum value from Now Platform applications.
https://www.servicenow.com/docs/bundle/xanadu-servicenow-platform/page/product/csdm-implementation/concept/csdm-landing-page.html