What is Caching?

The process of storing copies of data in a temporary storage location so that they can be accessed more quickly.

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Caching works on a simple principle: doing the work once and remembering the result. When a computer performs a task (like fetching data from a slow database or calculating a complex formula), it stores the result in a fast 'cache' (like RAM). The next time it needs that data, it just grabs it from the cache instantly.

        graph LR
  Center["What is Caching?"]:::main
  Rel_file_systems["file-systems"]:::related -.-> Center
  click Rel_file_systems "/terms/file-systems"
  Rel_cpu_cache["cpu-cache"]:::related -.-> Center
  click Rel_cpu_cache "/terms/cpu-cache"
  Rel_cache["cache"]:::related -.-> Center
  click Rel_cache "/terms/cache"
  classDef main fill:#7c3aed,stroke:#8b5cf6,stroke-width:2px,color:white,font-weight:bold,rx:5,ry:5;
  classDef pre fill:#0f172a,stroke:#3b82f6,color:#94a3b8,rx:5,ry:5;
  classDef child fill:#0f172a,stroke:#10b981,color:#94a3b8,rx:5,ry:5;
  classDef related fill:#0f172a,stroke:#8b5cf6,stroke-dasharray: 5 5,color:#94a3b8,rx:5,ry:5;
  linkStyle default stroke:#4b5563,stroke-width:2px;

      

🧒 5 yaşındaki gibi açıkla

Caching is like writing down a phone number on a sticky note and putting it on your computer screen. Instead of having to go to the other room and look through a giant phone book every time you want to call that person, you can just look at the note and dial the number immediately.

🤓 Expert Deep Dive

Caching happens at every level of computing: [CPU Cache](/tr/terms/cpu-cache) (L1/L2/L3), Browser Cache, Database Cache (Redis/Memcached), and CDN. The hardest part of caching is 'Cache Invalidation'—knowing when to delete the old data so the user doesn't see outdated information.

📚 Kaynaklar