Caching for System Design Interviews

- Caching cuts latency 50x and reduces DB load by 95%+. Cache-aside with Redis is the default. Layer CDN for glo...

30-second elevator pitch: "Caching stores frequently accessed data in memory so reads skip the database. I start with cache-aside using Redis as the default, add CDN for global static assets, and choose invalidation strategy based on freshness requirements. Cache-aside handles most scenarios, and I layer additional strategies only when the problem deman…