Cache - definition

Cache is temporary storage to store files that are not 100% necessary for a running program or page but makes the process faster. A cache is a volatile memory which means it can’t store information if the power gets disconnected. i.e.: because of stored files in cache memory, the browser can open a tab way faster than usual. In another case, apps can be opened easily and can continue from the last session because of the cache. But once the memory is cleared then the app or browser has to load the run file from the start again. Cache is some form of DRAM (Dynamic Random Access Memory). Sometimes it is called CPU memory.
Cache memory works as a buffer between the main memory and the CPU, it can process instruction coming from CPU 10x-100x faster than the main memory (RAM). There are three (3) types of cache memory that are: L1, L2 & L3 [Here, L denotes Level].