Caching — System Design Roadmap

Reducing latency and load by storing frequently accessed data closer to where it's needed

Steps in Caching

Caching Fundamentals — intermediate · Why caching works, cache hit/miss ratios and what makes data cacheable
Cache Placement (Client, CDN, Server) — intermediate · Where caches live along the request path: browser, CDN, application, database
Cache Invalidation Strategies — intermediate · TTL-based expiry, explicit invalidation and the challenges of staying consistent
Cache-Aside, Write-Through & Write-Back — intermediate · Common caching patterns and their consistency/performance trade-offs
Content Delivery Networks (CDN) — intermediate · Caching static and dynamic content at edge locations close to users
Distributed Caching (Redis/Memcached) — intermediate · Shared, in-memory caches used across multiple application servers