What does „Vi IMproved“ mean? „vim – Vi IMproved, a programmers text editor“ VIM is an improved version of the editor „vi“, one of the standard text editors on UNIX systems. VIM adds many of the features that you would expect in an editor: Unlimited undo, syntax coloring, split windows, visual selection, graphical user interface (read: menus, mouse control, scrollbars, text selection), and much much more. VIM runs on many (all?:) operating systems!