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Each point that you mark is saved in a circular list or ring. Each buffer has its own Mark Ring. You can go back to these old marks by repeatedly typing C-u C-<Space> The Kill Ring contains blocks of killed text. Emacs has only one kill ring, common to all buffers, allowing you to delete text from one buffer and insert it in another. Old deletions are saved so that you can, for instance, recover text 3 deletions back by doing C-u 3 C-y.