Depends on your level of expertise. The entire purpose for developing windows was so that there would be a User Interface for computers. Ever tried working on code without a user Interface? If you are using internet Explorer, Press the buttons Alt, then V, then C. That is what you would be looking at if there were no interface. If you are Using Firefox, press Alt, then V, then O.
Kind of hard to read all of that Huh?
The short answer is that it makes a computer and/or software way more user friendly.
Humans are very visually oriented as evidenced by the large portion of the brain that is involved with decoding impulses from the eyes. So the graphical user interface is what predominates in the experience of the interaction between a user and a computer program.
So people can see things.
The user interface is software.
This is what the user sees and works with when using the computer..Different types are Graphical user interface, Command line interface and Manual driven interface
Graphical User Interface
when the window is user friendly then we can easily use the user interface.
Graphic User Interface (user-friendly)
Magic User Interface was created in 1993.
Graphical User Interface
When an interface is easy to use it is normally referred to as a user friendly interface. A friendly user interface saves time and does not require any special skills to operate.
Graphical user interface
Aqua - user interface - was created in 2000-01.
Graphical User Interface.
The 'shell' is a user interface program that interfaces between a user of the system and the Operating System. It is the user interface.