Icons are a visual representation of something on your computer. For example, a blue "e" on your screen most likely repersents the Internet Explorer program. An icon that looks like a sheet of paper is probably a text document. By clicking and dragging icons, you can move the actual files they represent to various locations on your computer's hard drive. By double-clicking an application icon, you can open the program. Icons are one of the fundamental features of the graphical user interface (GUI). They make computing much more user-friendly than having to enter text commands to accomplish anything. Some Unix nerds would beg to differ, but I'm talking about normal people here.