How do you implement caching in distributed systems?

Short answer: Strong Answer Strategy: Use Azure Redis Cache Real-world

Example code

Product catalog API: Cache frequently accessed data TTL = 5 minutes Advanced patterns: Cache-aside pattern Write-through caching Interview tip: Mention: “Cache invalidation is hardest problem”

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.