Structural Testing is a method used in software engineering to evaluate the internal structures or workings of a program. It focuses on the code itself, ensuring that all paths, branches, and conditions are tested. This type of testing helps identify hidden errors and ensures that the software behaves as expected under various conditions. The primary goal of Structural Testing is to improve code quality and reliability. By examining the internal logic and structure, developers can find and fix issues early in the development process. This leads to more robust software and reduces the likelihood of failures in production environments.