Custom resources play an important role in a data catalog's ability to accurately represent your company's metadata. Users need to be able to add resources that aren't directly from data sources to give a full picture of their data landscapes. Now, users can create these custom resources directly from the UI and manage them like any other resource.
After designating which resources should have this feature enabled in your metadata profile, users will be able to access these resources in the "Other resources" section in the "New resource" dropdown (in the example below, the custom resources are "Bank account" and Credit card").
For more information, refer to the documentation.