SAP HCI is created as Integration System-as-a-Services (PAAS) which helps to integrate numerous independent systems/purposes for a company course of action. HCI can do Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid model. HCI offers Adapters (Connectivity options) such as: Cleaning soap Adapter, IDoc, HTTP, Mail, SFTP,Ariba, https://sap-s-4hana-cloud03580.blogsmine.com/28603192/hana-cloud-integration