Test-Driven Development (TDD) is a software design approach that emphasizes writing tests before coding. This method fosters high-quality software by ensuring that every feature is tested from the outset, reducing bugs and enhancing maintainability. By defining clear requirements through tests, developers gain a deeper understanding of the desired functionality. TDD promotes continuous feedback and iterative improvements, leading to more robust architectures. Additionally, it encourages better design decisions, as developers must consider how code will be tested. Overall, embracing TDD cultivates a culture of quality, ensuring that software evolves reliably and efficiently.