SAP HCI is intended as Integration Platform-as-a-Company (PAAS) which helps to integrate a number of impartial units/applications for a business method. HCI can do Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid design. HCI delivers Adapters (Connectivity solutions) such as: SOAP Adapter, IDoc, HTTP, Mail, SFTP,Ariba, oData. https://s4-hana-cloud-tutorial14691.dreamyblogs.com/28636309/hana-cloud-integration