System testing is concerned with:

System testing focuses on verifying the behavior of an entire system or product as it operates within its defined requirements. This stage of testing evaluates the complete and integrated software solution to ensure that it meets all specifications and functions as intended in a real-world scenario. It assesses the system's compliance with requirements that have been specified for the entire product, rather than just individual components or modules. This holistic approach is essential because it helps identify issues that may arise from the interaction between different components of the system, which could be overlooked during earlier testing stages like unit or integration testing.

The emphasis on the system as a whole allows testers to validate end-to-end workflows and ensure that all parts work together seamlessly, which is vital for user satisfaction and overall system reliability.