What is TDD about?

"TDD is not about taking teeny-tiny steps, it's about being able to take teeny-tiny steps. Would I code day-to-day with steps this small? No. But when things get the least bit weird, I'm glad I can. Try teeny-tiny steps with an example of your own choosing. If you can make steps too small, you can certainly make steps the right size. If you only take larger steps, you'll never know if smaller steps are appropriate."

-- Kent Beck