Security:?

Short answer: API Gateway: Centralize authentication and authorization through an API Gateway (e.g., OAuth 2.0, JWT) to secure access to your microservices. Service-to-Service Security: Use mutual TLS or API keys for securing internal communication between services. Role-based Access Control (RBAC): Enforce security policies using RBAC or attribute-based access control (ABAC) for fine-grained permissions.

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.