Ticket Granting Server. A sub-system of the KDC used to grant Kerberos tickets.
The Ticket-Granting Service (TGS) authorizes the user to gain access to the network resources by generating and issuing tickets.
Ticket Granting Server. A Kerberos server--trusted by every entity on a network--that grants "tickets."
Ticket Granting Service. Issues tickets for a desired service that are used by the user to actually gain access to the service. The TGS usually runs on the same host as the KDC.