GNU Emacs Manual - Key Help

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## Documentation for a Key

The most basic `C-h` options are `C-h c` (`describe-key-briefly`) and `C-h k` (`describe-key`). `C-h c key` prints in the echo area the name of the command that key is bound to. For example, `C-h c C-f` prints ``forward-char'`. Since command names are chosen to describe what the commands do, this is a good way to get a very brief description of what key does.

`C-h k key` is similar but gives more information: it displays the documentation string of the command as well as its name. This is too big for the echo area, so a window is used for the display.

`C-h c` and `C-h k` work for any sort of key sequences, including function keys and mouse events.

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