SAP HCI is intended as Integration System-as-a-Provider (PAAS) which helps to integrate a number of unbiased methods/programs for a company process. HCI can do Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid model. HCI gives Adapters (Connectivity selections) such as: SOAP Adapter, IDoc, HTTP, Mail, SFTP,Ariba, oData. https://s4hanacloudtutorial50493.blogsumer.com/23511040/hana-cloud-integration