SAP HCI is designed as Integration Platform-as-a-Assistance (PAAS) which helps you to combine many independent units/apps for a business approach. HCI can do Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid product. HCI delivers Adapters (Connectivity choices) which include: SOAP Adapter, IDoc, HTTP, Mail, SFTP,Ariba, oData.