Cache

[jason s]

A cache is a collection of data duplicating original values computed earlier or stored somewhere else. Given the original data is expensive to compute, or to fetch compared to the cost of reading the cache. You can say that cache memory is a temporary storage area where frequently accessed data can be stored for rapid access. It is not necessary to re-fetch or recomputing the original data, you can simply look in for the cache copy. cache makes the average access time shorter.