[Q]Brief description of "cache"

I've been wondering what cache is. Is it like temporary files or "memory" for an app? Similar to ram, in a way? Once I know what it is then I'll know what "cached memory" in storage section is and why I have over 200mb. Thanks for your time.😊

Sent from my Boost Mobile Moto G (xt1031) with Tapatalk. Running Android 5.0.2 stock soak test with root

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