Test Driven Development (TDD) is a software development process that relies on the repetition of a very short development cycle, where requirements are turned into specific test cases, then the software is improved to pass the new tests. Coursera's TDD catalogue teaches you how to adapt this approach to create reliable, bug-free software. You'll learn to write test cases for your software's functionality before the actual coding process, understand the cycle of writing a test, making it pass, then refactoring. Additionally, you'll gain insights into how TDD can improve your software design, increase code coverage, and reduce the time spent on debugging, thereby increasing your efficiency as a software developer.