Power BI developers integrate data from multiple sources, such as SQL databases, Excel, cloud platforms (Azure, AWS), Google Analytics, and CRM systems (Salesforce, Dynamics 365). They ensure seamless data flow by setting up data pipelines, API connections, and direct queries for real-time access. Power BI developers use Power Query transformations to clean, filter, and standardize data, ensuring accuracy. This consolidated, structured approach eliminates data silos and improves cross-functional reporting. Businesses benefit from a single source of truth, enabling different teams—finance, sales, marketing—to access up-to-date, reliable insights for strategic decision-making.