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After using Emacs for a while, you may accumulate a large number of buffers and may want to eliminate the ones you no longer need. There are several commands for doing this.
Kill a buffer, specified by name (kill-buffer).
Offer to kill each buffer, one by one.
C-x k (kill-buffer) kills one buffer, whose name you
specify in the minibuffer. If you type just RET in the
minibuffer, the default, killing the current buffer, is used. If the
current buffer is killed, the buffer that has been selected recently but
does not appear in any window now is selected. If the buffer being
killed contains unsaved changes, you are asked to confirm with yes
before the buffer is killed.
The command M-x kill-some-buffers asks about each buffer, one by
one. An answer of y means to kill the buffer. Killing the current
buffer or a buffer containing unsaved changes selects a new buffer or asks
for confirmation just like kill-buffer.