Answer
Caching stores frequently accessed data to reduce database load and improve response speed. Redis is commonly used.
Quick Answer
A caching layer stores frequently accessed data in fast storage (Redis, Memcached) instead of hitting the database every time. A user profile read 1000x/minute should come from Redis, not Postgres. This dramatically reduces database load, cuts response times from 100ms to 1ms, and lets your database handle write-heavy work it's designed for.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ