Stateful Services:?

Short answer: For certain use cases (e.g., long-running transactions), services may need to maintain some state, but this should be stored externally (e.g., in databases or stateful workflows).

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.