SAP HCI is developed as Integration System-as-a-Support (PAAS) which helps you to combine various unbiased systems/applications for a business method. HCI can do Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid model. HCI gives Adapters (Connectivity possibilities) which include: Cleaning soap Adapter, IDoc, HTTP, Mail, SFTP,Ariba, oData. https://s4hanacloudonboarding70357.nizarblog.com/28424353/hana-cloud-integration