Test driven development (TDD) is a software development practice where tests are written before the code that makes those tests pass. This approach helps developers think about requirements and expected behavior up front, which leads to cleaner design, fewer bugs, and more maintainable code. Instead of writing tests after the fact, TDD ensures that every piece of functionality has a corresponding test from the very beginning.

By writing tests first, developers gain immediate feedback on whether their implementation meets expectations. This encourages smaller, incremental code changes and continuous verification, which results in higher confidence in code correctness. It also makes refactoring safer, since changes are constantly validated by the existing test suite.

Adopting TDD can lead to better collaboration between teams, clearer requirements, and improved long-term software quality. With TDD integrated into your workflow, you spend less time debugging and more time delivering reliable features.

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https://keploy.io/docs/concepts/reference/glossary/test-driven-development/