Kerberos delegation enables a Kerberos service to impersonate a Kerberos client user and get a service ticket for another service on behalf of the client user.
The services in an Informatica domain need to connect to other services to complete an operation. You can connect to other services through delegated authentication. In delegated authentication, when a user is authenticated by a service, the service uses those credentials to connect to another service. For example, when a pmcmd user accesses Power Center Integration Service, the service acts as the pmcmd user to authenticate with Power Center Repository Service.