memory is a small unit of ultra-fast memory that is used to store recently accessed or frequently accessed data so that the CPU does not have to retrieve this data from slower memory circuits such as RAM.

The answer is "Cache memory".

Explanation:

Cache memory, which is specifically created for the circuits of the CPU, that is also called the primary cache, and the secondary cache is called the memory cache contained on an external circuit. It is used to access information from the cache easily, instead of having to get, it from the main memory of the computer.