What does the "buffers" column show in the free output?

Question

linux

In the output of the free command, there is a "buffers" indicator among others.
man says these are the buffers used by the kernel. If I understand correctly, then we are talking about
I / O buffers.
Is it so?
And what then can be judged on the basis of this indicator?

Answer 1

About the memory used for buffers. If she is needed for something else, she will be released immediately.