SAP Fiori is a design system that enhances the user experience for SAP applications with a modern and easy-to-use interface across various devices. It replaces the traditional SAP GUI with simple and personalized options. Fiori includes different types of apps: transactional, analytical, factsheet, GUI, and custom apps, all designed to support business tasks and provide real-time insights. Built on SAPUI5, these apps run on the SAP Business Technology Platform (BTP) or SAP S/4HANA, using OData services for data communication, which improves user efficiency and efficiency in enterprise operations.