SAP HCI is designed as Integration System-as-a-Service (PAAS) which helps to integrate multiple unbiased units/purposes for a company course of action. HCI can perform Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid model. HCI provides Adapters (Connectivity choices) like: Cleaning soap Adapter, IDoc, HTTP, Mail, SFTP,Ariba, oData. https://sap-s-4hana-cloud95938.ampedpages.com/hana-cloud-integration-55625164