| It stands for Character User Interface. | It stands for Graphical User Interface. |
| The user performs tasks with the help of keyboard only by typing text commands. | In this interface, other than keyboard, mouse or any other pointing device can also be used. |
| The user has to memorise and type the commands to perform each task. | The user performs tasks by selecting and clicking the options available. |
| Its usage is difficult and may require expertise. | It is comparatively easier than CUI in its usage. |
| MS-DOS is an example of CUI. | Windows is an example of GUI. |