juniorCaching
Where can caching occur in a typical web application?
Updated Apr 28, 2026
Short answer
Caching can happen at the browser, CDN, load balancer, application, and database levels.
Deep explanation
Caching is essential for performance optimization. Caching can happen at the browser, CDN, load balancer, application, and database levels. By reducing the need to access slower storage layers (like HDDs or remote databases), systems can achieve much lower latency.
Real-world example
Storing the results of a complex database query in Redis.
Common mistakes
- Not setting a TTL, leading to the cache growing indefinitely or serving very old data.
Follow-up questions
- Is cache persistent?