Fortunately, a new kind of operating system came along. If you see some nice little pictures with descriptive words underneath them, you are probably using a GUI (pronounced gooey, if you can believe that) or graphical user interface. A GUI lets you click with the mouse to start a program or do other computer tasks such as copying a file. The biggest advantage of a GUI is that little pictures are drawn on the screen to make the concepts easier to understand. In a GUI, you might be able to move a file by clicking on a picture of that file and dragging it to another part of the screen. In a comand line system, you would have no happy little pictures. You would have to know the exact command required to move the file.