SAP HCI is built as Integration Platform-as-a-Support (PAAS) which really helps to combine various independent programs/purposes for a company process. HCI can do Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid model. HCI provides Adapters (Connectivity selections) such as: Cleaning soap Adapter, IDoc, HTTP, Mail, SFTP,Ariba, oData. https://s4-hana-cloud-trial24691.mybjjblog.com/hana-cloud-integration-41670902