An SAP S/4HANA on-premise deployment encompasses traditional in-residence IT infrastructure products. This deployment model describes an instance of SAP S/4HANA that may be physically hosted on client assets. Clients can Choose between a procedure conversion (brownfield) implementation, which requires an current SAP natural environment and transforms it into SAP S/4HANA; https://sap-support16048.wizzardsblog.com/34109046/s4hana-for-dummies