What's the meaning of 'inoremap' in vimrc

Question

There is a line below in vimrc example file

inoremap Ctrl-u Ctrl-G u Ctrl-u

What\'s the meaning of inoremap and w

Answer 1

I also wondered about this. See http://vim.wikia.com/wiki/Mapping_keys_in_Vim_-Tutorial(Part_1)#Insert_mode_maps :

Insert mode maps

To map keys that work only in the insert and replace modes, use the 'imap' or 'inoremap' command.

Example: The following command maps to insert the directory name of the current buffer:

:inoremap  =expand('%:p:h')

To display the currently defined insert mode maps, use the 'imap' command without any argument:

:imap

To remove a keymap from insert mode, use the ':iunmap' command. For example, the following command removes the insert mode map for .

:iunmap 

As printable keys insert a character in the current buffer in insert mode, you should use non-printable keys to create insert mode maps. Some examples for non-printable keys include the function keys , keys prefixed with the Ctrl or Alt key.

[snip]

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So, for example, in my ~/.vimrc I have

inoremap jk 
inoremap jj 

which when pressed in Insert mode return me to Normal mode.