A cache is a data store, thus "internal cache information" is metadata relating to a data storage facility that is used solely by a system. That is, a data store that is not intended for user consumption (internal use only).
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A Web cache is a temporary memory in your browser where temporary information about the web site you are visiting are stored. Information like login id, password, previous history of pages you visited etc would be stored in the cache...
A cache is intended to speed things up. The larger the cache, the slower it performs. If it becomes slower to access the cache than the memory itself, it defeats the purpose of having a cache.
L3 cache
Browser Cache
cache is more expensive and it will increase the cost of the system terribly. processing of more than one cache will complicate the design of CPU and increase the burden on CPU.