Final answer:
The Service Catalogue is a current list of services offered to customers, while the Service Portfolio includes the entire lifecycle of all services, including those in development and retired services.
Step-by-step explanation:
The difference between a Service Catalogue and a Service Portfolio in the context of IT service management (often within frameworks such as ITIL) lies in their scope and utility within an organization. The Service Catalogue is a subset of the Service Portfolio and includes only those services currently active and being offered to customers. It is a visible document available to customers that details the specifics, prices, and ordering information for each service. In contrast, the Service Portfolio encompasses the entire lifecycle of all services within a company, including services in development (Service Pipeline) as well as those retired from active service (Service Archive).
The Service Catalogue is concerned with the operational phase of services, detailing how a service can be used, its limitations, and the processes for requesting the service. On the other hand, the Service Portfolio is more strategic and includes evaluating and analyzing the performance, impact, and future directions of all services in all lifecycle stages.