Back to Glossary OneLake The unified, multi-cloud data lake storage layer at the foundation of Microsoft Fabric that provides a single, governed repository for all organizational data—structured, semi-structured, and unstructured. OneLake uses a hierarchical namespace (organized by workspace and item) and supports open data formats like Delta and Parquet, enabling all Fabric workloads, data engineering, data science, real-time analytics,… The unified, multi-cloud data lake storage layer at the foundation of Microsoft Fabric that provides a single, governed repository for all organizational data—structured, semi-structured, and unstructured. OneLake uses a hierarchical namespace (organized by workspace and item) and supports open data formats like Delta and Parquet, enabling all Fabric workloads, data engineering, data science, real-time analytics, and Power BI, to access the same data without duplication.
