Cache is the process of saving data temporarily so that the site, browser or app doesnt need to downliad it each time.
The core purpose of cache is to speeding up future requests, making application load faster than they would otherwise, as the data is stored locally. For instance, large images on a website can be quite large in size but rarely change, so caching these files means they only need to be accessed and downloaded once and thereafter load instantly.
Therefore, Cache helps improve the user experience of a website or application by offering fast load speeds.
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