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Keyboard shortcuts, key chords, key sequences, hotkeys, or any association between key combinations and corresponding actions in Emacs.

Anything related to key-bindings (a.k.a. keyboard shortcuts, hotkeys, etc.), i.e. the associations between key combinations and the corresponding actions triggered when the user presses such combinations.

For example, pressing keyboard key Alt + F4 closes an application on Microsoft Windows, while Ctrl + C copies the selected text into the clipboard for both Linux and Windows GUI applications.

The Emacs (logical) key sequences that are associated with such physical keyboard keys are typically M-<f4> (or ESC <f4>) and C-c, respectively.

It is Emacs key sequences that are used in Emacs key bindings.

See the Elisp manual, node Key Sequences.