We can use Workbench tool to run Sobject Describe endpoint
which provides information about five possible picklist values of this field.
Which include
All Channels(
AllChannels
) - assuming this is an aggregate option.Internal App (
App
) - assuming this value corresponds to internal Knowledge search activity for users having Salesforce or Salesforce Platform licensesPublic Knowledge Base (
Pkb
) - assuming this value corresponds to public site guest user profilesCustomer(
Csp
) - assuming this value corresponds to the Experience Cloud Customer portal users which have Community and Community Plus licensesPartner (
Prm
) - assuming this value corresponds to the Experience Cloud Partner portal users which have Partner user licenses