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How to define cache and caching?
Imagine you ask a group of people the outcome of 458 times 354. Now the group starts calculating the sum, either with or without their calculator or smartphone, and after a while someone shouts: 162132!
Now, if you ask the same question to the same group again, the whole crowd immediately shouts 162132, and that's caching. They had the answer cached in their mind and readily available.