Cache stores all the recent and the very active instructions and data into the cache memory. It has lesser time accessing these instructions than the main memory. It improves the speed of the CPU by acting as a high speed buffer between the CPU and the main memory. Types of cache memory is divided into three levels.
L1 cache – It is the primary type of cache memory. It’s the smallest in size but extremely fast. It is usually embedded in the CPU
L2 cache – Also referred to as the secondary cache. It has more capacity than L1. If instructions are not found on the L1 cache, they are searched in L2 by the microprocessor.
L3 cache
It is the largest in size but is usually the slowest in speeds as compared to the L1 and L2. It is developed to improve the performance of L1 and L2. Most L3 caches have double the speed of RAM