What is a critical reason for validating the output of a program?

Validating the output of a program is crucial because it ensures that the final results align with the user's requirements and expectations. This process confirms that the program is functioning correctly and producing the intended outcomes based on the input it receives. Meeting user requirements is fundamental in software development, as it directly impacts user satisfaction and the program's effectiveness.

When a program's output is validated, it helps identify discrepancies or errors that could lead to incorrect behavior, thereby enhancing the reliability of the software. Ensuring that the program meets specified criteria not only fosters trust with the user but also aids in refining the development process by highlighting areas that may need improvement or debugging before deployment.