What fast memory located close to the CPU speeds up data access by storing frequently used data?

• A. Cache
• B. RAM
• C. ROM
• D. Main memory

Answer: (A)

Cache memory sits right next to the CPU and keeps copies of data and instructions the processor is likely to reuse soon. Because it’s far faster to read from cache than from main memory, having frequently used data here dramatically speeds up access and improves overall performance. The CPU checks the cache first; if the needed data is there (a cache hit), it is retrieved quickly. If not (a cache miss), the data is pulled from slower main memory and placed in the cache for future use. There are usually several levels of cache (L1, L2, sometimes L3), with smaller, faster caches closest to the CPU. The other options describe larger, slower storage used for general data (RAM and main memory) or non-volatile storage (ROM), not the tiny, ultra-fast memory designed to speed up frequent accesses.