What are the trade-offs of different caching strategies in REST APIs?

Short answer: Client-side caching → Reduces server calls, but may serve stale data. Server-side caching → Faster responses, but increases memory usage. Proxy caching/CDN → Global scalability, but harder cache invalidation. Database caching (Redis) → Faster queries, but adds complexity and consistency issues.

Real-world example (ShopNest)

Creating an order is POST /api/orders → 201 with Location header. Fetching is GET /api/orders/{id} → 200 or 404.

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.