its cache memory.

A CPU cache is a cache used by the central processing unit

of a computer to reduce the average time to access memory.

The cache is a smaller, faster memory which stores copies of

the data from the most frequently used main memory

locations. As long as most memory accesses are to cached

memory locations, the average latency of memory accesses

will be closer to the cache latency than to the latency of

main memory.

When the processor needs to read from or write to a location

in main memory, it first checks whether a copy of that data

is in the cache. If so, the processor immediately reads from

or writes to the cache, which is much faster than reading

from or writing to main memory.