What is Cache

Cache is a small, high-speed memory storage that temporarily holds frequently accessed or recently used data, making it quicker for the CPU or other systems to retrieve that information when needed. The purpose of cache memory is to reduce the time it takes to access data from slower main memory (RAM) or storage devices (like a hard drive).

There are different types of cache, including:

1. CPU Cache: Built directly into the CPU (or located close to it), this cache stores data and instructions that the processor is likely to reuse. It is divided into levels:
   • L1 Cache: The smallest and fastest cache, located directly in the CPU core.
   • L2 Cache: Larger but slower than L1, still very close to the CPU.
   • L3 Cache: Even larger and shared among multiple CPU cores, but slower compared to L1 and L2.
2. Disk Cache: Used by storage devices, such as hard drives or SSDs, to speed up the process of reading and writing data.
3. Web Cache: Stored in web browsers or proxy servers, this cache saves copies of web pages or other web data locally, so that frequently visited pages can load faster without retrieving them again from the internet.

Cache memory is critical for improving performance in computers and systems, reducing latency, and making operations more efficient