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
ESC <f4>) and
It is Emacs key sequences that are used in Emacs key bindings.
See the Elisp manual, node Key Sequences.