What is the difference between the remap, noremap, nnoremap and vnoremap mapping commands in Vim?

I will explain mapping commands simply.

First, we have two general mapping commands:

• map - works recursively in normal, visual, select and operator pending modes.
• map! - works recursively in insert and command-line modes.

The non-recursive variations of these commands are:

• noremap - works non-recursively in normal, visual, select and operator pending modes.
• noremap! - works non-recursively in insert and command-line modes.

Then, we have mode-specific commands:

• nmap - works recursively in normal mode.
• imap - works recursively in insert mode.
• vmap - works recursively in visual and select modes.
• xmap - works recursively in visual mode.
• smap - works recursively in select mode.
• cmap - works recursively in command-line mode.
• omap - works recursively in operator pending mode.

And their non-recursive variations:

• nnoremap - works non-recursively in normal mode.
• inoremap - works non-recursively in insert mode.
• vnoremap - works non-recursively in visual and select modes.
• xnoremap - works non-recursively in visual mode.
• snoremap - works non-recursively in select mode.
• cnoremap - works non-recursively in command-line mode.
• onoremap - works non-recursively in operator pending mode.

Finally, remap is a boolean option that allows for mappings to work recursively. It is worth mentioning that you should always keep this option at the default on.