What 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?

Cache memory is the correct answer to the given question

Explanation:

Cache memory holds the instruction of frequently access data. When any user requests some file or resources it firstly stored in the cache memory that was the reason the cache memory is much faster than all the memory. The cache memory is also known as ultra-fast memory which is used to store recently instruction. In the computer system, there are two types of cache primary cache and the secondary cache.

Hence Cache is the correct answer