The visualization phase focuses on transforming data into actionable insights through interactive dashboards and reports. Power BI developer phase emphasizes user-friendly designs with clear navigation, enabling stakeholders to extract insights effortlessly. Developers prioritize interactivity by implementing slicers, filters, and drill-through features. Effective visualizations bridge the gap between complex data and business decisions, ensuring that stakeholders understand performance metrics and trends at a glance, ultimately driving informed decision-making and operational improvements.