Data modeling structures the relationships between datasets to support efficient analysis. Developers use tools like Power BI Desktop to design logical models, define hierarchies, and create calculated fields using DAX. A well-built data model improves query performance, reduces report complexity, and enhances user experience. Power BI development services also ensures the solution can handle scalability and future changes. This phase provides the framework for visualizations by organizing data in an intuitive and accessible manner. Without effective modeling, reports may become slow, inconsistent, or inaccurate. A strong data model is essential for delivering actionable, reliable insights.