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Integration testing verifies the interactions and data exchanges between different modules, components, or systems of software. In the context of unit testing, integration testing focuses on combining individual units that have been previously tested in isolation to ensure their combined functionality is correct. It helps identify issues related to interfaces, data consistency, and overall system behavior. This level of testing bridges the gap between individual unit tests and end-to-end system tests, ensuring seamless communication and coordination between various parts of the software. Integration testing ultimately contributes to a more robust and reliable software product by validating the integration of units within the larger context of the software system.