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Test Driven Development (TDD) is a software development approach in which tests are written before the code, as a means to drive the design and implementation of the software. It emphasizes writing automated unit tests for small chunks of functionality before implementing the corresponding code. The process involves creating a test, observing it fail, writing code to make it pass, refactoring the code if necessary, and then repeating this cycle for the next piece of functionality. In the context of Software/Software Testing/Unit Testing/Unit Test Frameworks, TDD plays an important role in ensuring that individual units of code function correctly and meet their intended requirements. By writing tests first, developers can clearly define what a unit should do, making it easier to develop code that meets those expectations. This approach also helps to improve the overall quality of the software, as it encourages the creation of well-designed, modular, and maintainable code. TDD fits into this hierarchy by providing a specific development methodology for Unit Testing within the broader context of Software Testing. It relies on Unit Test Frameworks to provide the tools necessary to write and run automated tests, enabling developers to confidently implement and verify individual units of code before integrating them into the larger system. By following TDD principles, developers can build high-quality software that is robust, reliable, and maintainable over time.