Definition
A memory cache is a small, fast memory component that stores frequently used data, allowing quicker access than retrieving it from main memory 💾. Think of it as the brain's short-term memory. It's a crucial component in computer systems for improving performance. When the CPU needs data, it first checks the memory cache. If the data is there (a "cache hit"), it's retrieved quickly. If not (a "cache miss"), it fetches the data from main memory and also stores it in the cache for future use. Memory caches are essential for smooth operation.