"White Box" refers to a type of testing in software development where the internal workings of an application are known to the tester. This approach allows testers to examine the code, algorithms, and data structures, ensuring that all paths and conditions are tested. It is often used to identify vulnerabilities and improve code quality. In contrast to Black Box testing, which focuses solely on input and output without knowledge of the internal processes, White Box testing provides a deeper understanding of how the software operates. This method is essential for optimizing performance and ensuring that the software meets its design specifications.