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== Cache ==
In order to boost system performance, a cache is a high-speed data storage layer that stores frequently accessed or recently used data. By retaining a copy of the most often visited data in a quicker and more convenient storage location, it is intended to decrease the amount of time it takes to access data.
Web servers, databases, operating systems, and CPUs are just a few of the systems that utilise caches. Caching, for instance, enables web servers to keep frequently requested web pages in memory and speed up serving them to consumers. To cut down on the time it takes to access frequently used instructions and data from main memory, CPUs store them in caches.
Caching can enhance system performance by lowering the number of time-consuming or expensive actions needed to access data. If the cached data is not updated when changes are made to the underlying data source, caching also raises the chance of stale data. Cache management and eviction tactics are crucial factors to take into account when building caching systems as a result.
== Cache Consistency ==
