SAP HCI is built as Integration System-as-a-Provider (PAAS) which really helps to integrate many unbiased techniques/apps for a company method. HCI can do Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid design. HCI features Adapters (Connectivity alternatives) which include: Cleaning soap Adapter, IDoc, HTTP, Mail, SFTP,Ariba, oData. https://s4-hana-cloud-architectur86173.aioblogs.com/81845452/hana-cloud-integration