What a service desk does
Beyond fixing individual issues, a service desk manages IT service delivery as a whole: fulfilling service requests, handling incidents, coordinating changes, and tracking assets. It follows ITIL processes and acts as the formal interface between IT and the rest of the business.
Service desk vs help desk
A help desk is reactive and issue-focused (often customer-facing); a service desk is broader, process-driven, and typically internal. Every service desk includes help-desk functions, but a help desk isn't necessarily a service desk. For customer support, a help desk's lighter, conversational model fits better.
