Since Power BI has been transformed and become part of  the Microsoft Fabric platform, we have a number of new, useful options at our disposal. OneLake is the place where all of an organization’s structured, semi-structured, and unstructured data now resides, and is stored in an open Delta Parquet format for ease of access, sharing, and management . The OneLake catalog is a feature within Microsoft Fabric that works as a centralized place to store, find, analyze data.