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Integration testing verifies the interaction between different components, modules, or systems to ensure they function together correctly. In the context of Software Defect Tracking and under Software Configuration Management, it plays a crucial role in identifying issues that may arise when individual units are combined. By revealing discrepancies early on, integration testing helps maintain software quality, enhances reliability, and streamlines the development process. It involves testing interfaces, data exchange, and overall functionality to ensure seamless communication between components, ultimately contributing to a robust and cohesive software product.