What Is Data Modeling in Power BI? Data modeling in Power BI is the process of structuring, organizing, and defining relationships between tables (and other elements like calculations) in a semantic model. This enables accurate, efficient analysis and reporting. It transforms raw data from multiple sources into a cohesive, intuitive structure optimized for querying, filtering, and visualization. In Power BI Desktop, you shape data after importing or connecting to sources via Power Query. The ...