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.
Ticket-Granting Service. That portion of the KDC that is responsible for issuing tickets.
Ticket Granting Service. A server that issues tickets for a desired service which are in turn given to users for access to the service. The TGS usually runs on the same host as the KDC