Resilience Libraries:?

Short answer: Resilience4j provides support for retries, timeouts, circuit breakers, and fallbacks in a microservices environment. Example: In a Payment Service, if a payment request to an external provider fails, a fallback could be to use an alternative payment gateway.

Real-world example (ShopNest)

If Payment is down, the Order service fails fast with a circuit breaker instead of hanging every checkout thread.

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.