Cache overview for magento 2

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What is cache?

Cache is a place which allows a web browser to save a copy of the page so if the user comes back later, the page does not have to be downloaded again.

– How does each device save the cache ?
– What kind of cache is saved in Magento 2 ?
– How is the cache key saved ?
– How to clear cache in 1 block ?
– What is the difference between page cache vs block cache ?

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