What is the main purpose of cache memory and what are its advantages in data storage systems?

The main task of cache memory is to speed up access to frequently used data by storing it in a location that is faster compared to the main storage. In data storage systems, cache reduces read and write delays, increasing overall performance and reducing the load on slower devices (e.g., hard drives). Advantages of cache memory:

• Fast access to data, which reduces system response time.
• Decreased number of accesses to the main storage, which extends its lifespan.
• Increased system throughput by optimizing input-output operations.

For example, in a database, cache can store the results of frequent queries to avoid executing them repeatedly.