Fallbacks:?

Short answer: Provide an alternative response or action when a service is unavailable or fails. For example, the Order Service might fallback to a cached price when the Pricing Service is down.

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.