Gray-Box Testing is a software testing technique that combines elements of both Black-Box Testing and White-Box Testing. Testers have partial knowledge of the internal workings of the application, allowing them to design test cases based on both the software's functionality and its underlying code structure. This approach helps identify issues that may not be visible through either testing method alone. By leveraging this dual perspective, Gray-Box Testing can improve the effectiveness of test cases and enhance overall software quality. It is particularly useful for integration testing and security assessments, where understanding the system's architecture can lead to more thorough evaluations.