What is the difference between TDD and traditional testing?

Short answer: TDD writes tests before code, driving design and implementation. Traditional testing usually happens after coding, as a verification step. TDD promotes continuous testing and refactoring, while traditional testing may be more manual or batch-driven. Integration Testing

Real-world example (ShopNest)

ShopNest unit tests cover pricing and discount rules so a bad coupon change fails in CI before customers see it.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.