What is the difference between buffer and cache memory in Linux?

Question

To me it\'s not clear what\'s the difference between the two Linux memory concepts : buffer and cache. I\'ve read through this post and it seems to

Answer 1

Quote from the book: Introduction to Information Retrieval

Cache

We want to keep as much data as possible in memory, especially those data that we need to access frequently. We call the technique of keeping frequently used disk data in main memory caching.

Buffer

Operating systems generally read and write entire blocks. Thus, reading a single byte from disk can take as much time as reading the entire block. Block sizes of 8, 16, 32, and 64 kilobytes (KB) are common. We call the part of main memory where a block being read or written is stored a buffer.