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Caching is the process of temporarily storing frequently accessed data in a faster storage layer to reduce latency, save computation, and improve system scalability. Instead of recomputing or refetching data from a slower source like a database or API, a cache serves it quickly from memory or nearby

Caches can exist on the client (OS or browser), on the server, or in a dedicated cache layer. Content delivery networks (CDNs) act as distributed caches to improve performance and availability. Reverse proxies and caching servers like Varnish can serve static and dynamic content directly. Web server

After followingScalability for Dummies - Part 2: Database, the database can now handle massive volumes of data and high concurrency. Despite this, users may still experience slow page loads when queries fetch large amounts of data. The bottleneck is no longer the database itself but the repeated ret