SAP HCI is designed as Integration System-as-a-Assistance (PAAS) which really helps to integrate several independent methods/applications for a company course of action. HCI can do Cloud to Cloud, Cloud to On-premise, On-premise to On-premise and Hybrid model. HCI offers Adapters (Connectivity options) which include: Cleaning soap Adapter, IDoc, HTTP, Mail, https://s4-hana-cloud-portal03579.eedblog.com/28225912/hana-cloud-integration