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In computing, cache is a temporary, high-speed storage area for frequently accessed data or instructions to improve performance by reducing access times. Data from slower main memory or storage is copied into the cache, allowing the CPU or other components to retrieve it much faster. Examples include CPU cache, which stores frequently used data close to the processor, and browser cache, which stores parts of webpages for quicker loading on subsequent visits.

How Cache Works

Storing Data: When data is requested, a copy is stored in the cache in case it's needed again soon.

Faster Retrieval: If the requested data is found in the cache (a "cache hit"), it's served from the cache, which is much faster than retrieving it from the original slower source.

Improved Performance: By serving many requests from the cache, overall system performance is significantly improved.