What are the pros and cons of using a message broker like Kafka or RabbitMQ in microservices?

Short answer: Pros: Asynchronous communication: Message brokers enable non-blocking communication between services, improving performance and responsiveness.

Explain a bit more

Loose coupling: Services don’t need to know about each other’s internals; they only communicate through events.

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.