TDD is a programming structure where developers first write all possible test cases and then develop code to pass each test case. The goal of TDD is to create more reliable and maintainable code. Some argue that TDD causes architecture design damage because it forces developers to think about all possible failure scenarios, while others see it as a necessary practice for ensuring software quality. Despite its benefits, some developers find TDD to slow them down and hinder their creativity. However, the effectiveness of TDD is still debated among developers, with opinions ranging from "TDD is dead" to "it's just due for a face lift". Ultimately, whether or not TDD is relevant depends on individual perspectives and experiences.