SAP Fiori is a new user experience for SAP applications that provides 300+ role-based apps for various business functions on desktops, smartphones, and tablets, and is built using SAP UI5. It includes transactional apps, fact sheets, and analytical apps that run on SAP NetWeaver Gateway and either an SAP HANA or other database, with fact sheets and analytical apps requiring HANA. SAP Fiori aims to provide a simple, responsive, and seamless experience across devices.