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A cache is a high-speed storage mechanism that temporarily stores frequently accessed data, files, or instructions to reduce retrieval time and improve overall system performance. Caches are used in various computing environments, including CPUs, web browsers, and applications, to avoid redundant data fetching from slower storage layers like hard drives or remote servers. Common types include CPU cache (L1, L2, L3), disk cache, and browser cache. Efficient caching enhances speed, reduces latency, and optimizes resource usage.
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