Another pair that should be differentiated is the CMDB (Configuration Management Database) and the service catalog. The CMDB is a centralized repository that stores information about all Configuration Items (CIs) within the IT infrastructure, including hardware, software, and their relationships.
As we already established, the service catalog provides detailed information about services available to users. In essence, while CMDB manages items within the IT environment and is part of IT Asset Management (ITAM), a service catalog contains information about services a specific department can provide, closer to ITSM.