What is cache?

Cache refers to a high-speed storage area that temporarily holds frequently accessed data and instructions, which allows for quicker access than retrieving them from the main memory or disk storage. The purpose of cache is to improve the efficiency and speed of data retrieval for the processor by minimizing the time needed to access information.

Cache memory is typically smaller but faster than main memory (RAM), and it helps in speeding up the processes by reducing the average time to access data from the main memory. It acts as an intermediary between the CPU and the main memory, storing copies of the most frequently used data and instructions to improve processing efficiency.

In contrast, a large storage area typically refers to traditional disk storage that is slower than cache. Similarly, while cache can be built using RAM technology, it is not classified specifically as a type of RAM but rather a functional implementation of RAM designed for speed. Lastly, a secondary storage device involves long-term data storage like hard drives or SSDs, which serve different purposes compared to the immediate access provided by cache memory.