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Test Driven Development (TDD) is an approach to software development where tests are written before the actual code, driving the design and implementation process. In the context of acceptance testing, TDD ensures that all requirements are thoroughly tested and that new features do not break existing functionality. It promotes close collaboration between developers and testers, leading to higher quality software with fewer defects. With TDD, acceptance tests serve as a blueprint for the expected behavior of the system, guiding developers in creating code that meets user needs and business requirements. By focusing on testing first, development teams can build robust, maintainable, and reliable software that consistently passes acceptance criteria.