What is the Rancher catalog?

Using the Rancher CLI and with kubectl we’re seeing these objects called catalogtemplates.management.cattle.io

Listing them I get a whole set of templates (helm charts?):

$ ./rancher apps list-templates
ID                                                             NAME                                CATEGORY
cattle-global-data:library-appdynamics-cluster-agent           appdynamics-cluster-agent           monitoring,appdynamics
cattle-global-data:library-argo-cd                             argo-cd                             
cattle-global-data:library-artifactory-ha                      artifactory-ha                      repository
cattle-global-data:library-artifactory-jcr                     artifactory-jcr                     repository
cattle-global-data:library-aws-event-sources                   aws-event-sources                   Knative,faas,serverless,AWS
...

I can even add my own chart with

./rancher catalog add my-helm-chart https://<my helm chart>

These don’t appear at all in the Rancher UI!

Is this something that is not exposed yet or is it a relic from an older Rancher version?

Can someone explain?

Thanks!