SAP HCI is intended as Integration System-as-a-Company (PAAS) which really helps to combine several impartial programs/apps for a business course of action. HCI can perform Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid design. HCI gives Adapters (Connectivity possibilities) for instance: SOAP Adapter, IDoc, HTTP, Mail, SFTP,Ariba, https://sap-s-4hana-cloud69135.blogsmine.com/28729584/hana-cloud-integration