What is the purpose of the [SetUp] and [TearDown] attributes?

Short answer: [SetUp] runs code before each test method to prepare test environment. [TearDown] runs code after each test to clean up resources or reset state.

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.