API Gateway: Use an API Gateway (e.g., Kong, NGINX) to route and aggregate?

Short answer: requests across microservices. Example: An Order Service could expose a POST /orders endpoint to accept new orders, and a Payment Service could expose a POST /payments endpoint to process payments.

Real-world example (ShopNest)

ShopNest’s API Gateway routes /orders to the Order service and /payments to Payment—clients talk to one entry point.

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.