What is the purpose of system testing?

The purpose of system testing is to evaluate the complete and integrated application in a way that confirms it meets the specified requirements. This testing phase is critical because it simulates real-world usage of the application, allowing testers to assess the software's functionality, performance, security, and reliability as a unified product.

By focusing on the application as a whole, system testing ensures that all components work together correctly and that the system fulfills its intended purpose as described in its requirements. It involves various testing methods, including functional, non-functional, and regression testing, to ensure that all aspects of the system behave as expected. This comprehensive approach allows for the identification of any defects or issues before the software is deployed to end users, ultimately contributing to the product's quality and user satisfaction.

In contrast, other options focus on different aspects of testing. For example, verifying the correctness of individual components refers to unit testing, which is distinct from system testing as it focuses on isolated segments of the application. Testing the installability of software pertains to installation testing, emphasizing setup and compatibility rather than overall functional compliance. Conducting user training sessions does not align with testing practices but rather falls under user support and resource development activities, which occur after testing has confirmed the system's readiness for use