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

Buffers are associated with a specific block device, and cover caching of filesystem metadata as well as tracking in-flight pages. The cache only contains parked file data. That is, the buffers remember what's in directories, what file permissions are, and keep track of what memory is being written from or read to for a particular block device. The cache only contains the contents of the files themselves.

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