juniorCaching
What is Caching?
Updated Apr 28, 2026
Short answer
Caching is the process of storing copies of data in a high-speed storage layer to serve future requests faster.
Deep explanation
Caching is essential for performance optimization. Caching is the process of storing copies of data in a high-speed storage layer to serve future requests faster. 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?