SAP HCI is intended as Integration Platform-as-a-Company (PAAS) which really helps to combine multiple independent 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://elliotstujk.verybigblog.com/27826266/hana-cloud-integration