SAP HCI is built as Integration System-as-a-Service (PAAS) which helps to combine various unbiased units/apps for a business approach. HCI can do Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid model. HCI offers Adapters (Connectivity choices) like: SOAP Adapter, IDoc, HTTP, Mail, SFTP,Ariba, oData. A number of https://s4-hana-cloud-faq24680.dreamyblogs.com/28520931/hana-cloud-integration