This document discusses Kyligence's unified semantic layer, which defines advanced semantic models on data lakes and synchronizes them across BI tools. It provides a single source of truth, increases efficiency, and improves governance. The semantic layer supports complex analysis scenarios and seamless integration with tools like Power BI, Excel, and Tableau. A demo shows how the AI-augmented engine works with ANSI SQL, MDX, and REST query interfaces and centralized access control. The semantic layer is used by many large enterprises to replace legacy data warehouse solutions and consolidate multiple data cubes.