SAP HCI is developed as Integration Platform-as-a-Company (PAAS) which helps to combine multiple independent programs/apps for a company 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, oData. https://s4-hana-cloud-portal14691.blogpostie.com/50384868/hana-cloud-integration