A FHIR server is an application that receives and processes FHIR requests while leveraging an architecture that is capable of storing and retrieving FHIR resources from an internal repository. In InterSystems products, the out-of-box solution for a FHIR server uses the Resource Repository as its storage. Depending on your product’s license, you might not be able to install a FHIR server with the Resource Repository. In this case, you should use the FHIR Interoperability Adapter to receive and process FHIR requests. When using the FHIR server, requests can be routed through an interoperability production before reaching the server’s internal architecture, but it is not required; FHIR servers that do not use an interoperability production can be significantly faster.