Cache is a form of fast memory used to avoid having to fetch the original data from a slower store.
For example a CPU may have one or more caches to hold often-used data and instructions. This avoids the need to fetch it from much slower RAM.
Web browsers also use a cache to store recently fetched files that make up a web page. If the web page is viewed again then it looks to the cache first before making a request to the web server. This makes page loading much faster.
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