The role of buffer and cache in Linux system

I. Buffer and the role of the cache

buffer: Something in memory that has not yet been written to the disk.

Role: In order to solve the CPU to the disk storage something when the speed difference, will accumulate a large wave of something again to disk storage, buffer used to accumulate something.

Cache: Something that has been read from disk to memory.

Function: When the CPU uses the something in the disk, the something is stored in memory, and the CPU is directly something from the cache when it is used again in a short period of time, it does not need to be transferred from the disk and saves time.

The role of buffer and cache in Linux system