A Power BI development company employs native Power BI connectors to integrate with databases, cloud services, and applications like Salesforce, SAP, and Excel. They use APIs and custom connectors to handle non-standard data sources. Data cleansing, transformation, and merging are done using Power Query to ensure consistency and accuracy. Power BI development company refreshes and real-time streaming are configured to keep reports up to date. These methods enable seamless integration of diverse data sources into a unified platform.