Allows for setting up a Service Catalog that will be accessible to end users via the Employee Portal. The Catalog list is for categorizing the catalog articles. Each multiline text field (e.g., Description, Included, etc) on the Service Catalog list will appear as a separate tab within the Service Catalog on the Employee Portal.
Refer below article for more detail on service catalog
How to configure Service Catalog Page in Portal? - Crow Canyon Software Support