Graphical User Interface (GUI)

At the most basic level, every program, from Notepad to your operating system, is really just a messy jumble of code that is completely incomprehensible to most people. That's why these programs come with a graphical user interface, or GUI (prounounced "gooey"). The GUI provides you with the shiny buttons, menus, and icons that make your computer easy to use.

Sometimes, however, the GUI is limited in what it can do, or gets broken somehow. In instances like this, you can use the command line.