Cache Layers in Modern Applications

What is Cache? Any temporary storage for copies of data in order to get faster responses. It can be related to hardware, where the CPU accesses caches (L1, L2, L3) to store copies of data from main memory and improve access speed. This happens due to multiple factors: the technology used to build caches (L1, L2, L3) is different from the one used for main memory, making it faster but more expensive, and it is also physically closer to the CPU, which reduces data transfer latency. The cache typically stores recently and/or frequently accessed data. Note: Cache is different from a Data Buffer , since a buffer is used as temporary storage not to get the most frequently and recently used data, but to manage the problem when we have consumers and producers operating at different rates. In this post we will discuss primarily cache as internet technologies used to provide scalability, performance, cost reduction and more (focusing on system design). For example, web browsers cache HTML, image